[issue17911] traceback: add a new thin class storing a traceback without storing local variables

[Robert Collins]

Robert Collins added the comment:

The decimal failure is due to _format_final_exc_line now filtering out 'None' as well, because the string captured values of objects leads to None -> 'None' before we do rendering.

I think in this case its reasonable to change the behaviour (since None itself was already filtered out, its only the special case of a value of 'None' that worked previously).

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<http://bugs.python.org/issue17911>
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