D19844: Hide the video when the preview is disabled, avoid computing the preview when it is disabled

[Méven Car]

meven added a dependent revision: D19782: Allow dolphin to auto play previewed media file.

REPOSITORY
  R318 Dolphin

REVISION DETAIL
  https://phabricator.kde.org/D19844

To: meven, #dolphin, elvisangelaccio
Cc: kfm-devel, alexde, feverfew, spoorun, navarromorales, firef, andrebarros, emmanuelp, mikesomov
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