D18398: Fix a few more QML runtime errors/warnings

[Volker Krause]

vkrause created this revision.
Herald added a project: Okular.
Herald added a subscriber: okular-devel.
vkrause requested review of this revision.

REPOSITORY
  R223 Okular

BRANCH
  master

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

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

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