D24726: Fix null pointer reference when extraction fails

[Albert Astals Cid]

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

REPOSITORY
  R243 KArchive

BRANCH
  upstream_master

REVISION DETAIL
  https://phabricator.kde.org/D24726

To: pvuorela, davidllewellynjones, dfaure, aacid
Cc: apol, kde-frameworks-devel, LeGast00n, GB_2, michaelh, ngraham, bruns
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