D6376: Fix double delete crash during shutdown

[Albert Astals Cid]

aacid added a comment.


  I was able to half reproduce it for a while and came up with https://phabricator.kde.org/D11891 which I think is a bit less of a workaround than this code.

REPOSITORY
  R289 KNotifications

REVISION DETAIL
  https://phabricator.kde.org/D6376

To: cullmann, #frameworks
Cc: aacid, mpyne, rjvbb, michaelh, ngraham
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