Handle cases of connect and disconnect and show dummy UI to play.

Currently on connect with bluetooth we sometimes end up with no UI to
play if AVRCP has not sent the right metadata. We should always allow
the user to press something so that it can avoid first connect jitter.

Bug: b/26928143
Change-Id: I4c351a4d9a885ab690ea0619c26d1aac13fe21cf
1 file changed