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

[Barry A. Warsaw]

Barry A. Warsaw <barry at python.org> added the comment:

Sounds good.  This needs to go into 2.6 and 3.0.  And while you're add
it, can you add catch_warnings to the __all__?

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versions: +Python 3.0

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