Don't load the moodbar if the song was stopped

When an async moodbar load completes, it checks to see if the song is still playing and should update the UI.
It however failed to check if the song was stopped, so it would load a moodbar when no song was playing.
It now checks the player state before emitting a change.
You don't need break here as you are returning just above (i.e. this statement can never be executed, so having it is just confusing IMHO)