fix: Use the IR's inputs if it has them for OQ3

[kshyatt-aws]

Issue #, if available: N/A

Description of changes: Make sure not to use the inputs kwarg if it's provided but empty and the IR itself has inputs

Testing done: Tests passed locally, checked that this fixes the parallelized processing with PL notebook

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.87%. Comparing base (4127749) to head (550c122).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #34   +/-   ##
=======================================
  Coverage   96.86%   96.87%           
=======================================
  Files          16       16           
  Lines        2715     2716    +1     
=======================================
+ Hits         2630     2631    +1     
  Misses         85       85           

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