D29772: Don't compare string with empty string

[Ismael Asensio]

iasensio added a comment.


  No rush, I just wanted to use `Requested Changes` for the first and last time here at Phab :D

REPOSITORY
  R108 KWin

REVISION DETAIL
  https://phabricator.kde.org/D29772

To: ognarb, #plasma, iasensio
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