D8662: Validate that for all attributes an itemData exists

[Volker Krause]

vkrause accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R216 Syntax Highlighting

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D8662

To: dhaumann, vkrause, cullmann
Cc: #frameworks