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

[Alexander Belopolsky]

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

Another crash:

>>> from datetime import *
>>> datetime.now(timezone(timedelta(0), '\uD800')).strftime('%Z')
Segmentation fault

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