Check if Default instead of Is_Kwarg

[TheBurchLog]

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 15.27%. Comparing base (95d48b6) to head (3414adf).
Report is 27 commits behind head on develop.

Files	Patch %	Lines
brewtils/request_handling.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           develop     #453       +/-   ##
============================================
- Coverage    92.39%   15.27%   -77.13%     
============================================
  Files           28       28               
  Lines         3644     3817      +173     
============================================
- Hits          3367      583     -2784     
- Misses         277     3234     +2957     

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