[issue3639] segfaults calling warnings.warn() with non-string message

[Brett Cannon]

Brett Cannon <brett at python.org> added the comment:

The patch doesn't actually bother with a translation as the code causing
issue is only there to prevent infinite recursion. So if the object
being used is not a string, then there is no need to worry as it is not
part of the infinite recursion problem.

I also added a bunch of missing error checks.

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keywords: +needs review
Added file: http://bugs.python.org/file11220/fix_warn_funky_types.diff

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