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

[Alexander Belopolsky]

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

Committed revision 87137.  Needs backporting.  Also as Victor suggested, _lsprof.c code can be refactored to avoid roundtrips of unicode through utf8 char*.

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<http://bugs.python.org/issue6697>
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