django__django-13820
Permit migrations in non-namespace packages that don't have __file__
Verdict: the fix is stated in the issue (Tier A).
Instead, I propose to augment getattr(m, '__file__', None) with and isinstance(m.__path__, list).
The text states the fix: “Instead, I propose to augment getattr(m, '__file__', None) with and isinstance(m.__path__, list).”
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