Message 64734 - Python tracker

Thanks for the patch. This isn't specific to threads at all, so the test
doesn't need to spawn a thread, just raise an exception from a nested
function with a parameter, catch it, delete the object the parameter
referred to, and then check that the object has been destroyed.

I don't know the exception handling code very well, so I'd like someone
more familiar with it to check that the patch is correct and efficient.
Collin, would you do the honors?