Minor improvement: replace equals("") with isEmpty()

[valfirst]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.98%. Comparing base (6e69860) to head (365589c).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #180   +/-   ##
=========================================
  Coverage     78.98%   78.98%           
  Complexity      395      395           
=========================================
  Files            27       27           
  Lines           728      728           
  Branches        131      131           
=========================================
  Hits            575      575           
  Misses          153      153           

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