D8012: Only assert on broken GL when we're rendering using GL

[Kai Uwe Broulik]

broulik accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R120 Plasma Workspace

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D8012

To: davidedmundson, #plasma, broulik
Cc: plasma-devel, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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