[issue3664] Pickler.dump from a badly initialized Pickler segfaults

[Alexandre Vassalotti]

Alexandre Vassalotti <alexandre at peadrop.com> added the comment:

Here's the fix. The added check in Pickler_dump should prevent any
segfaults due to __init__() errors. 

I also added the check proposed by Christian as a safe-guard in case a
core developer adds a new method that doesn't check if the object was
properly initialized.

Added file: http://bugs.python.org/file11704/_pickle.c

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