D9805: Show error message to the user

[Frederik Schwarzer]

schwarzer updated this revision to Diff 25181.

CHANGES SINCE LAST UPDATE
  https://phabricator.kde.org/D9805?vs=25132&id=25181

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

AFFECTED FILES
  src/board.cpp

To: schwarzer, #kde_games
Cc: aacid
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