D10300: [server] Don't crash when a subsurface gets commited whose parent surface got destroyed

[David Edmundson]

davidedmundson accepted this revision.
This revision is now accepted and ready to land.
Restricted Application edited projects, added Plasma on Wayland; removed Plasma.

REPOSITORY
  R127 KWayland

BRANCH
  subsurface-parent-destroyed

REVISION DETAIL
  https://phabricator.kde.org/D10300

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