D11118: Show a message if Konsole part is not installed

[Nathaniel Graham]

ngraham added a comment.


  In D11118#221519 <https://phabricator.kde.org/D11118#221519>, @rominf wrote:
  
  > Is the UI better now? Note the animation and layout.
  
  
  +1 now!
  
  > 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?).
  
  For me, without Discover installed, I get a KIO error message after I click the button:
  F5746191: error.png <https://phabricator.kde.org/F5746191>

REPOSITORY
  R318 Dolphin

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

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