[Differential] [Accepted] D551: Start extraction only if Ark has write permissions

[rthomsen (Ragnar Thomsen)]

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

REVISION DETAIL
  https://phabricator.kde.org/D551

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To: elvisangelaccio, rthomsen
Cc: kde-utils-devel