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

[Christoph Roick]

croick edited the summary of this revision.

REPOSITORY
  R32 KDevelop

BRANCH
  dockwidgetcrash

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

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