[issue14600] Change ImportError reference handling, naming

[Brian Curtin]

Brian Curtin <brian at python.org> added the comment:

How about this patch? Adds NULL checking and merges PyErr_SetExcWithArgsKwargs inside PyErr_SetImportError since it's not needed by itself. Docs are also updated in line with these changes.

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Added file: http://bugs.python.org/file25248/issue14600.diff

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