D29684: Improve opengl debug messages

[Aleix Pol Gonzalez]

apol added a comment.


  I'm expecting QDebug would handle it, I don't see why opengl would be giving us an empty debug message though.

REPOSITORY
  R108 KWin

REVISION DETAIL
  https://phabricator.kde.org/D29684

To: apol, #kwin
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