D7947: Fix crash when closing dock widgets from within the widget

[Aleix Pol Gonzalez]

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

REPOSITORY
  R32 KDevelop

BRANCH
  dockwidgetcrash

REVISION DETAIL
  https://phabricator.kde.org/D7947

To: croick, #kdevelop, apol
Cc: kdevelop-devel
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