Add "empty list" validation(check) to list.py

[IngRobertFodor]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (9fd8084) to head (3fd11d8).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #135   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           36        36           
  Lines         1147      1152    +5     
  Branches        62        62           
=========================================
+ Hits          1147      1152    +5     

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[huangsam]

Thanks for the changes @IngRobertFodor!