D18397: Fix crash on canceling the file open dialog

[Nicolas Fella]

nicolasfella accepted this revision.

REPOSITORY
  R223 Okular

BRANCH
  arcpatch-D18397

REVISION DETAIL
  https://phabricator.kde.org/D18397

To: vkrause, apol, nicolasfella
Cc: apol, nicolasfella, okular-devel, tfella, ngraham, darcyshen, aacid
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