[issue6697] Check that _PyUnicode_AsString() result is not NULL

[Alexander Belopolsky]

Alexander Belopolsky <belopolsky at users.sourceforge.net> added the comment:

issue6697b.diff addresses Marc's comments.  Thanks for the review.

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stage: patch review -> commit review
Added file: http://bugs.python.org/file19972/issue6697b.diff

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