D18398: Fix a few more QML runtime errors/warnings

[Albert Astals Cid]

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

REPOSITORY
  R223 Okular

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D18398

To: vkrause, aacid
Cc: okular-devel, tfella, ngraham, darcyshen, aacid
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