diff --git a/meshroom/common/core.py b/meshroom/common/core.py
index 766480e6..e9e20579 100644
--- a/meshroom/common/core.py
+++ b/meshroom/common/core.py
@@ -9,6 +9,9 @@ class CoreDictModel:
     def __len__(self):
         return len(self._objects)
 
+    def __bool__(self):
+        return bool(self._objects)
+
     def __iter__(self):
         """ Enables iteration over the list of objects. """
         return iter(self._objects.values())
@@ -26,12 +29,18 @@ class CoreDictModel:
     def objects(self):
         return self._objects
 
-    # TODO: operator[]
     def get(self, key):
         """
-        Raises a KeyError if key is not in the map.
         :param key:
-        :return:
+        :return: the value or None if not found
+        """
+        return self._objects.get(key)
+
+    def getr(self, key):
+        """
+        Get or raise an error if the key does not exists.
+        :param key:
+        :return: the value
         """
         return self._objects[key]
 
diff --git a/meshroom/common/qt.py b/meshroom/common/qt.py
index 8b6e324a..26f51270 100644
--- a/meshroom/common/qt.py
+++ b/meshroom/common/qt.py
@@ -43,7 +43,9 @@ class QObjectListModel(QtCore.QAbstractListModel):
         return self.size() > 0
 
     def __getitem__(self, index):
-        """ Enables the [] operator """
+        """ Enables the [] operator.
+        Only accepts index (integer).
+        """
         return self._objects[index]
 
     def data(self, index, role):
@@ -96,9 +98,17 @@ class QObjectListModel(QtCore.QAbstractListModel):
     @QtCore.Slot(str, result=QtCore.QObject)
     def get(self, key):
         """
-        Raises a KeyError if key is not in the map.
         :param key:
-        :return:
+        :return: the value or None if not found
+        """
+        return self._objectByKey.get(key)
+
+    @QtCore.Slot(str, result=QtCore.QObject)
+    def getr(self, key):
+        """
+        Get or raise an error if the key does not exists.
+        :param key:
+        :return: the value
         """
         return self._objectByKey[key]
 
diff --git a/meshroom/core/node.py b/meshroom/core/node.py
index aceee3f7..ac4cc788 100644
--- a/meshroom/core/node.py
+++ b/meshroom/core/node.py
@@ -608,7 +608,7 @@ class BaseNode(BaseObject):
                     assert isinstance(att, ListAttribute)
                     att = att.value.at(int(idx))
         else:
-            att = self._attributes.get(name)
+            att = self._attributes.getr(name)
         return att
 
     @Slot(str, result=Attribute)
diff --git a/tests/test_model.py b/tests/test_model.py
index 6c6c784a..18492123 100644
--- a/tests/test_model.py
+++ b/tests/test_model.py
@@ -18,26 +18,24 @@ class DummyNode(QObject):
     name = Property(str, getName)
 
 
-def test_coreModel_add_remove():
-    m = CoreDictModel(keyAttrName='name')
-    node = DummyNode("DummyNode_1")
-    m.add(node)
-    assert len(m) == 1
-    assert m.get("DummyNode_1") == node
+def test_DictModel_add_remove():
+    for DictModel in (CoreDictModel, QObjectListModel):
+        m = DictModel(keyAttrName='name')
+        node = DummyNode("DummyNode_1")
+        m.add(node)
+        assert len(m) == 1
+        assert len(m.keys()) == 1
+        assert len(m.values()) == 1
+        assert m.get("DummyNode_1") == node
 
-    m.pop("DummyNode_1")
-    assert len(m) == 0
+        assert m.get("something") == None
+        with pytest.raises(KeyError):
+            m.getr("something")
 
-
-def test_listModel_add_remove():
-    m = QObjectListModel(keyAttrName='name')
-    node = DummyNode("DummyNode_1")
-    m.add(node)
-    assert len(m) == 1
-    assert m.get("DummyNode_1") == node
-
-    m.remove(node)
-    assert len(m) == 0
+        m.pop("DummyNode_1")
+        assert len(m) == 0
+        assert len(m.keys()) == 0
+        assert len(m.values()) == 0
 
 
 def test_listModel_typed_add():