[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:

The new patch ditches the WarningsRecorder class and just returns a list
that is directly mutated. I also removed all uses of
test.test_support.catch_warning() and moved them over. Docs have been
thoroughly updated to give example usage. And lastly, I fixed bsddb to
use catch_warnings() where it was blindly resetting the warnings filter.
It still sets a filter at the top of the module, but I didn't want to
have to search for all potential places where catch_warnings() would
have been needed.

Added file: http://bugs.python.org/file11416/clean_up_catch_warnings.diff

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