D23411: Fix crash in writer collection and cleanup

[Stefan Brüns]

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

REPOSITORY
  R286 KFileMetaData

BRANCH
  fixWriterCollection

REVISION DETAIL
  https://phabricator.kde.org/D23411

To: astippich, bruns, mgallien, ngraham
Cc: apol, kde-frameworks-devel, #baloo, lots0logs, LeGast00n, fbampaloukas, GB_2, domson, ashaposhnikov, michaelh, astippich, spoorun, ngraham, bruns, abrahams
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