[issue15925] email.utils.parsedate() and email.utils.parsedate_tz() should return None when date cannot be parsed

[Roundup Robot]

Roundup Robot added the comment:

New changeset 3b03d31f6a79 by R David Murray in branch 'default':
#15925: fix regression: return None for null and non-date strings.
http://hg.python.org/cpython/rev/3b03d31f6a79

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nosy: +python-dev

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