D12643: Don't crash if fopen fails

[Sune Vuorela]

svuorela created this revision.
svuorela added a reviewer: aacid.
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REVISION SUMMARY
  If we have a qrc url, all checks so far fails, and this one returns null.
  
  It might also be possible to get here in some race condition.

REPOSITORY
  R223 Okular

BRANCH
  Applications/18.04

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

AFFECTED FILES
  generators/markdown/converter.cpp

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