D15379: Fixes crashes related to closing tabs with splits

[Tomaz Canabrava]

tcanabrava added reviewers: hindenburg, ngraham, sandsmark.

REPOSITORY
  R319 Konsole

REVISION DETAIL
  https://phabricator.kde.org/D15379

To: tcanabrava, hindenburg, ngraham, sandsmark
Cc: konsole-devel, herrold, ngraham, maximilianocuria, hindenburg
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