[issue39717] Fix exception causes in tarfile module

[Ram Rachum]

Ram Rachum <ram at rachum.com> added the comment:

I'm also strongly against using `from None`. When I'm debugging, I'm like a man who got lost in the desert and is about to die of thirst. Any possible insight into what happened is like an oasis, even if there are just a few drops of water there.

Also, some tools like Django and Sentry show you all the local variables for your stacktraces, which is a godsend. These often have important information that sheds light on what went wrong, and if you remove the traceback they'll be gone.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39717>
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