Fixed all MvC tests

integration/test_mvc.py

@@ -170,9 +170,11 @@ class TestModelverseCore(unittest.TestCase):
                 "model_overwrite",
                 "Empty",
                 "instantiate_node",
+                "",
                 "Class",
                 "B",
                 "instantiate_node",
+                "",
                 "Class",
                 "C",
                 "exit",