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

[Martin Panter]

Martin Panter added the comment:

Robert: in issue17911-2.patch (and the eventual commit) you added a check for value == 'None' in _format_final_exc_line(). Why was this necessary? I think it is the cause of my Issue 27348 regression:

>>> traceback.format_exception(Exception, Exception("One"), None)
['Exception: One\n']
>>> traceback.format_exception(Exception, Exception("None"), None)
['Exception\n']

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nosy: +martin.panter

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