D5739: Improve some error messages

[Aleix Pol Gonzalez]

apol created this revision.
Restricted Application added a project: Frameworks.

REPOSITORY
  R304 KNewStuff

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D5739

AFFECTED FILES
  src/attica/atticaprovider.cpp
  src/core/engine.cpp

To: apol, #frameworks, whiting, leinir
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