D29805: Thumbnail djvu: avoid to exit(1) when it should not

[Méven Car]

meven created this revision.
meven added reviewers: Frameworks, broulik, ngraham.
Herald added projects: Dolphin, Frameworks.
Herald added subscribers: kfm-devel, kde-frameworks-devel.
meven requested review of this revision.

REVISION SUMMARY
  A child process exited with 1 as result but it wasn't an error case.
  
  BUG: 420542
  BUG: 420074
  FIXED-IN: 20.08

TEST PLAN
  Previewed a djvu file

REPOSITORY
  R320 KIO Extras

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D29805

AFFECTED FILES
  thumbnail/djvucreator.cpp

To: meven, #frameworks, broulik, ngraham
Cc: kde-frameworks-devel, kfm-devel, waitquietly, azyx, nikolaik, pberestov, iasensio, aprcela, fprice, LeGast00n, cblack, fbampaloukas, alexde, Codezela, feverfew, meven, michaelh, spoorun, navarromorales, firef, ngraham, andrebarros, bruns, emmanuelp, rdieter, mikesomov
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