[issue12703] Improve error reporting for packaging.util.resolve_name

[Rémy HUBSCHER]

Rémy HUBSCHER <remy.hubscher at ionyse.com> added the comment:

Here is the patch for the test case.

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hgrepos: +84
Added file: http://bugs.python.org/file23428/test_util.patch

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<http://bugs.python.org/issue12703>
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