D17017: Fix assert when cleaning up symlinks in PreviewJob

[David Faure]

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

REPOSITORY
  R241 KIO

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D17017

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