fix(dataclass_proxy): return None for other node types

- Fix data class proxy to return None when used with not scripted module node type

Author: Thibault-Pelletier

tests/test_scripted_module_dataclass.py

@@ -139,3 +139,11 @@ def test_scripted_proxy_is_compatible_with_complex_types(a_scene):
     assert node.GetParameter(name.my_time) == json.dumps(dt.time().isoformat())
     assert node.GetParameter(name.my_path) == json.dumps(Path(__file__).as_posix())
     assert node.GetParameter(name.my_model_node) == json.dumps(model_node.GetID())
+
+
+def test_proxy_over_non_scripted_module_returns_none_value(a_scene):
+    node = vtkMRMLModelNode()
+    proxy = create_scripted_module_dataclass_proxy(Simple, node, a_scene)
+    assert proxy.a is None
+    assert proxy.b is None
+    assert proxy.c_default is None

trame_slicer/utils/scripted_module_node_dataclass_proxy.py

@@ -111,6 +111,9 @@ def __set__(self, instance, value):
         self.set_value(value)
 
     def get_value(self):
+        if not isinstance(self._node, vtkMRMLScriptedModuleNode):
+            return None
+
         if self._state_id not in self._node.GetParameterNames():
             return self._default if self._default != MISSING else None