Commits on Oct 6, 2021

1. handle an exception without a traceback …

   When an exception does not have a traceback there are no frames
   to filter, but there's an explicit check for the last frame which
   will fail if there are no frames.
   
   An example exception with this problem can be seen when using
   concurrent.futures.ProcessPoolExecutor.  When it reconstitutes a
   remote exception it has serialized the traceback to a string it
   includes as the error message instead of an object that can be
   inspected.

   

   kjurka authored and davidism committed Oct 6, 2021
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