D29814: Fix segfault on no restart args

[Jiří Paleček]

jpalecek added a reviewer: Frameworks.

REPOSITORY
  R285 KCrash

REVISION DETAIL
  https://phabricator.kde.org/D29814

To: jpalecek, #frameworks
Cc: kde-frameworks-devel, LeGast00n, cblack, michaelh, ngraham, bruns