Fix UnbouldLocalError bug

[ppinchuk]

Fix bug where UnbouldLocalError is thrown because variable is not defined. Add tests for the correct behavior.

reVX test to be fixed in an upcoming PR

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 67.71%. Comparing base (2c79570) to head (4f5985e).

Files with missing lines	Patch %	Lines
rex/utilities/utilities.py	0.00%	2 Missing ⚠️

❌ Your patch status has failed because the patch coverage (0.00%) is below the target coverage (70.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #210      +/-   ##
==========================================
- Coverage   67.72%   67.71%   -0.01%     
==========================================
  Files          40       40              
  Lines        7090     7091       +1     
  Branches     1037     1037              
==========================================
  Hits         4802     4802              
- Misses       1961     1962       +1     
  Partials      327      327              

Flag	Coverage Δ
unittests	67.71% <0.00%> (-0.01%)	⬇️

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Files with missing lines	Coverage Δ
rex/utilities/utilities.py	44.66% <0.00%> (-0.13%)	⬇️

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