D29036: Print meaningful warning when there is no QGuiApplication

[Vlad Zahorodnii]

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

REPOSITORY
  R278 KWindowSystem

REVISION DETAIL
  https://phabricator.kde.org/D29036

To: broulik, #plasma, zzag
Cc: kde-frameworks-devel, LeGast00n, cblack, michaelh, ngraham, bruns
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