fix custom exceptions

[aniketmaurya]

What does this PR do?

Fixes the case when a custom exception has multiple args and can't be sent via multiprocessing queue.

fixes #424

Before

Hangs indefinitely

After

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• Did you make sure to update the docs?
• Did you write any new necessary tests?

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89%. Comparing base (38d7169) to head (c8cdb52).
Report is 1 commits behind head on main.

Additional details and impacted files

@@         Coverage Diff         @@
##           main   #425   +/-   ##
===================================
  Coverage    89%    89%           
===================================
  Files        31     31           
  Lines      2023   2025    +2     
===================================
+ Hits       1808   1811    +3     
+ Misses      215    214    -1