D9805: Show error message to the user

[Frederik Schwarzer]

schwarzer created this revision.
schwarzer added a reviewer: KDE Games.
schwarzer added a project: KDE Games.
schwarzer requested review of this revision.

REVISION SUMMARY
  When no tilesets or backgrounds were found, KShisen just started with a blank field. Now the user is shown a message explaining what happened.
  
  I also want to try and check for this with CMake but since I need to look into that further, I wanted at least the error message in place.
  
  Comments?

REPOSITORY
  R412 KShisen

REVISION DETAIL
  https://phabricator.kde.org/D9805

AFFECTED FILES
  src/board.cpp

To: schwarzer, #kde_games
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