D18398: Fix a few more QML runtime errors/warnings

[Volker Krause]

This revision was automatically updated to reflect the committed changes.
Closed by commit R223:1fd9c052a6c7: Fix a few more QML runtime errors/warnings (authored by vkrause).

CHANGED PRIOR TO COMMIT
  https://phabricator.kde.org/D18398?vs=49904&id=50867#toc

REPOSITORY
  R223 Okular

CHANGES SINCE LAST UPDATE
  https://phabricator.kde.org/D18398?vs=49904&id=50867

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

AFFECTED FILES
  mobile/app/package/contents/ui/TreeDelegate.qml

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