D18250: fix detaching crashes

[Tomaz Canabrava]

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

REPOSITORY
  R319 Konsole

BRANCH
  arcpatch-D17643_1

REVISION DETAIL
  https://phabricator.kde.org/D18250

To: maciejn, tcanabrava
Cc: konsole-devel, thsurrel, ngraham, maximilianocuria, hindenburg
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