[issue4420] PyUnicode_Decode is not checked for NULL return value

[Roundup Robot]

Roundup Robot <devnull at devnull> added the comment:

New changeset 24179f82b7de by Éric Araujo in branch '2.7':
Fix obscure set crashers (#4420).  Backport of d56b3cafb1e6, reviewed by Raymond.
http://hg.python.org/cpython/rev/24179f82b7de

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nosy: +python-dev

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