D18965: Guard KCompressionDevice::open being called with no backend available

[Nathaniel Graham]

ngraham added reviewers: Plasma, Frameworks.
ngraham accepted this revision.
ngraham added a comment.
This revision is now accepted and ready to land.


  Fixes the crash for me and makes logical sense.

REPOSITORY
  R243 KArchive

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D18965

To: davidedmundson, #plasma, #frameworks, ngraham
Cc: ngraham, kde-frameworks-devel, michaelh, bruns
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