D12643: Don't crash if fopen fails

[Albert Astals Cid]

aacid requested changes to this revision.
aacid added a comment.
This revision now requires changes to proceed.


  Please add an emit error similar to the one a few lines below

REPOSITORY
  R223 Okular

REVISION DETAIL
  https://phabricator.kde.org/D12643

To: svuorela, aacid
Cc: #okular, ngraham, aacid
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