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

[Alexander Belopolsky]

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

I am attaching an untested rewrite of normalizeUserObj() in _lsprof.c for comments on whether it is worth the effort.  There might be other places where PyModule_GetName() can be profitably replaced with PyModule_GetNameObject().

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Added file: http://bugs.python.org/file19980/issue6697-lsprof.diff

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