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

[Nicolas Fella]

nicolasfella added a reviewer: KDE Connect.

REPOSITORY
  R224 KDE Connect

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

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