[3.12] gh-126461: Fix _Unpickler_ReadFromFile() error handling (GH-126485) #126496
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Handle _Unpickler_SetStringInput() failure.
(cherry picked from commit a1c57bc)
Co-authored-by: Victor Stinner vstinner@python.org
_pickle.load
with aMagicMock
results inSystemError
/aborts #126461