[Viewer] Handle checks on nodes when these node types don't exist

For checks on AliceVision nodes that may or may not be present,
we want to ensure that we are never attempting to access these node
instances if they have not been loaded by Meshroom.

meshroom/ui/qml/Viewer/PhongImageViewerToolbar.qml

@@ -39,7 +39,13 @@ FloatingPane {
         RowLayout {
             // pane title
             Label {
-                text: _reconstruction && _reconstruction.activeNodes.get("PhotometricStereo").node ? _reconstruction.activeNodes.get("PhotometricStereo").node.label : ""
+                text: {
+                    if (_reconstruction) {
+                        if (_reconstruction.activeNodes.get("PhotometricStereo") !== null)
+                            return _reconstruction.activeNodes.get("Photometric Stereo").node.label
+                    }
+                    return ""
+                }
                 font.bold: true
                 Layout.fillWidth: true
             }

meshroom/ui/qml/Viewer/Viewer2D.qml

@@ -27,7 +27,13 @@ FocusScope {
     property alias useLensDistortionViewer: displayLensDistortionViewer.checked
     property alias usePanoramaViewer: displayPanoramaViewer.checked
 
-    property var activeNodeFisheye: _reconstruction ? _reconstruction.activeNodes.get("PanoramaInit").node : null
+    property var activeNodeFisheye: {
+        if (_reconstruction) {
+            if (_reconstruction.activeNodes.get("PanoramaInit") !== null)
+                return _reconstruction.activeNodes.get("PanoramaInit").node
+        }
+        return null
+    }
     property bool cropFisheye : activeNodeFisheye ? activeNodeFisheye.attribute("useFisheye").value : false
     property bool enable8bitViewer: enable8bitViewerAction.checked
     property bool enableSequencePlayer: enableSequencePlayerAction.checked
@@ -623,7 +629,13 @@ FocusScope {
                     xOrigin: imgContainer.width / 2
                     yOrigin: imgContainer.height / 2
 
-                    property var activeNode: _reconstruction ? _reconstruction.activeNodes.get('PhotometricStereo').node : null
+                    property var activeNode: {
+                        if (_reconstruction) {
+                            if (_reconstruction.activeNodes.get("PhotometricStereo") !== null)
+                                return _reconstruction.activeNodes.get("PhotometricStereo").node
+                        }
+                        return null
+                    }
                     property var vp: _reconstruction ? getViewpoint(_reconstruction.selectedViewId) : null
                     property url sourcePath: getAlbedoFile()
                     property url normalPath: getNormalFile()
@@ -802,7 +814,13 @@ FocusScope {
                     orientationTag: imgContainer.orientationTag
                     xOrigin: imgContainer.width / 2
                     yOrigin: imgContainer.height / 2
-                    property var activeNode: _reconstruction ? _reconstruction.activeNodes.get("PanoramaInit").node : null
+                    property var activeNode: {
+                        if (_reconstruction) {
+                            if (_reconstruction.activeNodes.get("PanoramaInit") !== null)
+                                return _reconstruction.activeNodes.get("PanoramaInit").node
+                        }
+                        return null
+                    }
                     active: displayFisheyeCircleLoader.checked && activeNode
 
                     sourceComponent: CircleGizmo {
@@ -839,7 +857,13 @@ FocusScope {
 
                 // LightingCalibration: display circle
                 ExifOrientedViewer {
-                    property var activeNode: _reconstruction.activeNodes.get("SphereDetection").node 
+                    property var activeNode: {
+                        if (_reconstruction) {
+                            if (_reconstruction.activeNodes.get("SphereDetection") !== null)
+                                return _reconstruction.activeNodes.get("SphereDetection").node
+                        }
+                        return null
+                    }
     
                     anchors.centerIn: parent
                     orientationTag: imgContainer.orientationTag
@@ -933,7 +957,13 @@ FocusScope {
                     orientationTag: imgContainer.orientationTag
                     xOrigin: imgContainer.width / 2
                     yOrigin: imgContainer.height / 2
-                    property var activeNode: _reconstruction ? _reconstruction.activeNodes.get("ColorCheckerDetection").node : null
+                    property var activeNode: {
+                        if (_reconstruction) {
+                            if (_reconstruction.activeNodes.get("ColorCheckerDetection") !== null)
+                                return _reconstruction.activeNodes.get("ColorCheckerDetection").node
+                        }
+                        return null
+                    }
                     active: (displayColorCheckerViewerLoader.checked && activeNode)
 
                     sourceComponent: ColorCheckerViewer {
@@ -1289,7 +1319,13 @@ FocusScope {
                         id: ldrHdrCalibrationGraph
                         anchors.fill: parent
 
-                        property var activeNode: _reconstruction ? _reconstruction.activeNodes.get("LdrToHdrCalibration").node : null
+                        property var activeNode: {
+                            if (_reconstruction) {
+                                if (_reconstruction.activeNodes.get("LdrToHdrCalibration"))
+                                    return _reconstruction.activeNodes.get("LdrToHdrCalibration").node
+                            }
+                            return null
+                        }
                         property var isEnabled: displayLdrHdrCalibrationGraph.checked && activeNode && activeNode.isComputed
                         active: isEnabled
 
@@ -1495,7 +1531,13 @@ FocusScope {
 
                         MaterialToolButton {
                             id: displayFisheyeCircleLoader
-                            property var activeNode: _reconstruction ? _reconstruction.activeNodes.get("PanoramaInit").node : null
+                            property var activeNode: {
+                                if (_reconstruction) {
+                                    if (_reconstruction.activeNodes.get("PanoramaInit") !== null)
+                                        return _reconstruction.activeNodes.get("PanoramaInit").node
+                                }
+                                return null
+                            }
                             ToolTip.text: "Display Fisheye Circle: " + (activeNode ? activeNode.label : "No Node")
                             text: MaterialIcons.vignette
                             font.pointSize: 11
@@ -1508,7 +1550,13 @@ FocusScope {
 
                         MaterialToolButton {
                             id: displayLightingCircleLoader
-                            property var activeNode: _reconstruction.activeNodes.get("SphereDetection").node
+                            property var activeNode: {
+                                if (_reconstruction) {
+                                    if (_reconstruction.activeNodes.get("SphereDetection") !== null)
+                                        return _reconstruction.activeNodes.get("SphereDetection").node
+                                }
+                                return null
+                            }
                             ToolTip.text: "Display Lighting Circle: " + (activeNode ? activeNode.label : "No Node")
                             text: MaterialIcons.location_searching
                             font.pointSize: 11
@@ -1521,7 +1569,13 @@ FocusScope {
 
                         MaterialToolButton {
                             id: displayPhongLighting
-                            property var activeNode: _reconstruction.activeNodes.get('PhotometricStereo').node
+                            property var activeNode: {
+                                if (_reconstruction) {
+                                    if (_reconstruction.activeNodes.get("PhotometricStereo") !== null)
+                                        return _reconstruction.activeNodes.get("PhotometricStereo").node
+                                }
+                                return null
+                            }
                             ToolTip.text: "Display Phong Lighting: " + (activeNode ? activeNode.label : "No Node")
                             text: MaterialIcons.light_mode
                             font.pointSize: 11
@@ -1533,7 +1587,13 @@ FocusScope {
                         }
                         MaterialToolButton {
                             id: displayColorCheckerViewerLoader
-                            property var activeNode: _reconstruction ? _reconstruction.activeNodes.get("ColorCheckerDetection").node : null
+                            property var activeNode: {
+                                if (_reconstruction) {
+                                    if (_reconstruction.activeNodes.get("ColorCheckerDetection") !== null)
+                                        return _reconstruction.activeNodes.get("ColorCheckerDetection").node
+                                }
+                                return null
+                            }
                             ToolTip.text: "Display Color Checker: " + (activeNode ? activeNode.label : "No Node")
                             text: MaterialIcons.view_comfy
                             font.pointSize: 11
@@ -1557,7 +1617,13 @@ FocusScope {
 
                         MaterialToolButton {
                             id: displayLdrHdrCalibrationGraph
-                            property var activeNode: _reconstruction ? _reconstruction.activeNodes.get("LdrToHdrCalibration").node : null
+                            property var activeNode: {
+                                if (_reconstruction) {
+                                    if (_reconstruction.activeNodes.get("LdrToHdrCalibration") !== null)
+                                        return _reconstruction.activeNodes.get("LdrToHdrCalibration").node
+                                }
+                                return null
+                            }
                             property bool isComputed: activeNode && activeNode.isComputed
                             ToolTip.text: "Display Camera Response Function: " + (activeNode ? activeNode.label : "No Node")
                             text: MaterialIcons.timeline