Skip pull if remote branch does not exist

[isc-pbarton]

Fixes #562

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.

Project coverage is 41.85%. Comparing base (5a852bd) to head (c1ca545).

Files with missing lines	Patch %	Lines
cls/SourceControl/Git/Utils.cls	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #647      +/-   ##
==========================================
- Coverage   41.91%   41.85%   -0.06%     
==========================================
  Files          23       23              
  Lines        3023     3027       +4     
==========================================
  Hits         1267     1267              
- Misses       1756     1760       +4     

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