D7591: Fix use-after-free

[Allen Winter]

winterz added a comment.


  well, Dan already approved it.  So sure.

REPOSITORY
  R78 PIM: Incidence Editor

BRANCH
  hotfix-attachmentdialog-crash-on-exit

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

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