Hide the "No music found" note if the "New music available" or "Scanning music" note is shown
Hide the "No music found" note if the "New music available" or "Scanning music" note is shown

- Before 3688370d and 9239d10b, the "No music found" note used be eclipsed by the other notes but after these two commits, it had became partly visible from behind. Hence it has to be hidden when not applicable.

paulijar/music,Faldon/music,Faldon/music,paulijar/music,owncloud/music,Faldon/music,owncloud/music,owncloud/music,Faldon/music,owncloud/music,owncloud/music,paulijar/music,paulijar/music,Faldon/music,paulijar/music