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

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

The 3.0 forward port of r66386 still needs a once over before being
committed (there were enough differences that I don't think the review
of the 2.6 version is enough to cover the 3.0 version as well).

Once that is done, then this issue can be closed.

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