D7591: Fix use-after-free

[Daniel Vrátil]

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

REPOSITORY
  R78 PIM: Incidence Editor

BRANCH
  hotfix-attachmentdialog-crash-on-exit

REVISION DETAIL
  https://phabricator.kde.org/D7591

To: dkurz, #kde_pim, dvratil
Cc: dvasin, winterz, vkrause, mlaurent, knauss, dvratil
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