Modify check for existing reference data in compare function

[juraskov]

Fix issue #129

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 64.73%. Comparing base (3cb0ddb) to head (25d545a).

Files with missing lines	Patch %	Lines
mlptrain/configurations/configuration_set.py	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #130      +/-   ##
==========================================
- Coverage   64.75%   64.73%   -0.02%     
==========================================
  Files          37       37              
  Lines        4298     4299       +1     
==========================================
  Hits         2783     2783              
- Misses       1515     1516       +1     

Flag	Coverage Δ
python-3.9	60.78% <0.00%> (-0.02%)	⬇️
python-3.9-ace	60.78% <0.00%> (-0.02%)	⬇️
python-3.9-mace	64.54% <0.00%> (-0.02%)	⬇️

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