[issue3781] warnings.catch_warnings fails gracelessly when recording warnings but no warnings are emitted

[Brett Cannon]

Brett Cannon <brett at python.org> added the comment:

There is no specific reason why it would be, although that is an option
as well. Part of the problem with None is that it is a legitimate
default value for some arguments to showwarning() so it doesn't
necessarily reflect that no exception was raised if you don't look at
key attributes.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue3781>
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