Don't crash when inspecting classes loaded from cache (#2185)

`ClassDef`s are populated with faked `TypeInfo` when loaded from cache.
A faked `TypeInfo` doesn't have all attributes of a `TypeInfo` set. So
we'll avoid inspecting the faked `TypeInfo`

Author: flaeppe

mypy_django_plugin/transformers/models.py

@@ -14,6 +14,7 @@
     CallExpr,
     Context,
     Expression,
+    FakeInfo,
     NameExpr,
     RefExpr,
     Statement,
@@ -640,6 +641,10 @@ def statements(self) -> Iterable[Statement]:
         while model_bases:
             model = model_bases.popleft()
             yield from model.defs.body
+            if isinstance(model.info, FakeInfo):
+                # While loading from cache ClassDef infos are faked and 'FakeInfo' doesn't have
+                # all attributes of a 'TypeInfo' set. See #2184
+                continue
             for base in model.info.bases:
                 # Only produce any additional statements from abstract model bases, as they
                 # simulate regular python inheritance. Avoid concrete models, and any of their