FIX: Return None in compute power loss if no solution available

[hui-zhou-a]

Exit the method if solution doesn't exist.

Close #6107

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.26%. Comparing base (9015401) to head (7191f37).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6106      +/-   ##
==========================================
+ Coverage   85.25%   85.26%   +0.01%     
==========================================
  Files         170      170              
  Lines       64100    64100              
==========================================
+ Hits        54646    54653       +7     
+ Misses       9454     9447       -7     

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