Fixing config parser for bright limit

[astronomerritt]

Fixes #1022.

Desired behaviour:

• if the bright limit keyword is not in the config file (e.g. if you are using Rubin_known_object_prediction.ini) the bright limit cut should be skipped

Actual behaviour:

• code broke completely because I forgot to wrap some stuff in an if-statement in PPConfigParser

Fix:

• put the if-statement in

Review Checklist for Source Code Changes

• Does pip install still work?
• Have you written a unit test for any new functions?
• Do all the units tests run successfully?
• Does Sorcha run successfully on a test set of input files/databases?
• Have you used black on the files you have updated to confirm python programming style guide enforcement?

[codecov]

Codecov Report

Attention: Patch coverage is 41.66667% with 7 lines in your changes missing coverage. Please review.

Project coverage is 81.04%. Comparing base (c2b800c) to head (8ab8dbf).
Report is 14 commits behind head on main.

Files with missing lines	Patch %	Lines
src/sorcha/modules/PPConfigParser.py	41.66%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1024      +/-   ##
==========================================
+ Coverage   80.90%   81.04%   +0.13%     
==========================================
  Files          70       70              
  Lines        3148     3149       +1     
==========================================
+ Hits         2547     2552       +5     
+ Misses        601      597       -4     

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[astronomerritt]

Please ignore CodeCov, PPConfigParser is impossible to unit test properly in its current form. (One day I'll fix it. ONE DAY.)