Bugfix: Added warning behavior to CategoryRelations.intersection_cids

[Magnus167]

The function has a print statement. This implies the function can have behavior that can't be easily tested, or passed on to functions that may use it. (related - #803)

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.02 🎉

Comparison is base (d71ef87) 75.48% compared to head (c1e6c55) 75.50%.

❗ Current head c1e6c55 differs from pull request most recent head ed0a676. Consider uploading reports for the commit ed0a676 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #804      +/-   ##
===========================================
+ Coverage    75.48%   75.50%   +0.02%     
===========================================
  Files           31       31              
  Lines         3667     3670       +3     
===========================================
+ Hits          2768     2771       +3     
  Misses         899      899              

Impacted Files	Coverage Δ
macrosynergy/panel/category_relations.py	40.23% <100.00%> (+0.70%)	⬆️

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