D22299: Close KWordQuiz documents before closing the app

[Albert Astals Cid]

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

REPOSITORY
  R338 KWordQuiz

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D22299

To: yurchor, #kde_edu, aacid
Cc: aacid, apol, kde-edu, narvaez
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