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

[Alexander Belopolsky]

Changes by Alexander Belopolsky <belopolsky at users.sourceforge.net>:


Added file: http://bugs.python.org/file19970/issue6697a.diff

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue6697>
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