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

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

> I commited unicode_fromformat_U.patch as r78875.
> object_pyunicode_asstring-py3k.patch commited as r78876.

Backported as r79240 and r79241 to 3.1.

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