D6308: Fix crashy dialogs (found by krazy and by hand)

[Christoph Roick]

croick marked 2 inline comments as done.

REPOSITORY
  R33 KDevPlatform

BRANCH
  crashy

REVISION DETAIL
  https://phabricator.kde.org/D6308

To: croick, #kdevelop, apol
Cc: apol, anthonyfieroni, kdevelop-devel
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