[3.7] bpo-40126: Fix attribute out of scope during error handling in mock #19338
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Resolves an issue where the
patching
attribute raisesUnboundLocalError
as it can be out of scope if there is an error before assignment in loop execution (e.g. ifpatched.patchings is None
). This can happen if a library clearspatchings
in its own decorator cleanup.https://bugs.python.org/issue40126