D12830: Show message and hide controls if no player is available

[Aleix Pol Gonzalez]

apol accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R224 KDE Connect

BRANCH
  noplayerwarning

REVISION DETAIL
  https://phabricator.kde.org/D12830

To: nicolasfella, #kde_connect, apol
Cc: kdeconnect, Leptopoda, timothyc, jdvr, yannux, Danial0_0, johnq, Pitel, adeen-s, SemperPeritus, ndavis, daniel.z.tg, jeanv, seebauer, bugzy, MayeulC, menasshock, ach, apol
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