D15826: [Balooshow] Avoid out-of-bounds access when accessing corrupt db data

[Stefan Brüns]

bruns added a reviewer: poboiko.

REPOSITORY
  R293 Baloo

REVISION DETAIL
  https://phabricator.kde.org/D15826

To: bruns, #baloo, #frameworks, poboiko
Cc: anthonyfieroni, kde-frameworks-devel, ashaposhnikov, michaelh, astippich, 
spoorun, ngraham, bruns, abrahams