D11118: Show a message if Konsole part is not installed

[Henrik Fehlauer]

rkflx added a comment.


  In D11118#221519 <https://phabricator.kde.org/D11118#221519>, @rominf wrote:
  
  > As for good message for a user, I don't know how to check whether appstream:// is supported or not. The return value for `openUrl` doesn't help, it's `true` even if it fails (bug or maybe it's just me?).
  
  
  Did you look at how Gwenview is doing it?

REPOSITORY
  R318 Dolphin

REVISION DETAIL
  https://phabricator.kde.org/D11118

To: rominf, #dolphin
Cc: rkflx, ngraham, elvisangelaccio, broulik, progwolff, #dolphin
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