Add test_SetFromErrnoWithFilename_NULL

Merged Bitbucket Importer requested to merge bitbucket/merged-pr-212 into branch/default

Created originally on Bitbucket by msabramo (Marc Abramowitz)

Was already merged in Bitbucket before import, marked as merged by the import user

Add test_SetFromErrnoWithFilename_NULL

Tests that PyErr_SetFromErrnoWithFilename with filename == NULL works.

A prelude to refactoring PyErr_SetFromErrnoWithFilename to use PyErr_SetFromErrnoWithFilenameObject which was just added in PR #211 (closed).

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