D5739: Improve some error messages

[Aleix Pol Gonzalez]

This revision was automatically updated to reflect the committed changes.
Closed by commit R304:f72a417aecd0: Improve some error messages (authored by apol).

REPOSITORY
  R304 KNewStuff

CHANGES SINCE LAST UPDATE
  https://phabricator.kde.org/D5739?vs=14226&id=14230

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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