D14298: Fix crash with detach tab / hide tab buttons

[Tomaz Canabrava]

tcanabrava added reviewers: Konsole, hindenburg, sandsmark.

REPOSITORY
  R319 Konsole

REVISION DETAIL
  https://phabricator.kde.org/D14298

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