[issue20145] unittest.assert*Regex functions should verify that expected_regex has a valid type

[Kamilla]

Kamilla added the comment:

Applying changes as suggested by R. David Murray in the Core-mentorship e-mail list.

Instead of doing the if tests I've replaced the existing

   if isinstance(expected_regex, (bytes, str)):

by

   if expected_regex is not None:


And also made a change in one of the tests because I figure out it was wrong.

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Added file: http://bugs.python.org/file34364/validate_regex_improved.patch

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