D7885: Don't crash if a client (legally) uses deleted global contrast manager

[Martin Flöser]

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

REPOSITORY
  R127 KWayland

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D7885

To: davidedmundson, #plasma, graesslin
Cc: plasma-devel, #frameworks, leezu, ZrenBot, alexeymin, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, eliasp, sebas, apol, mart, hein
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