Fix queuepos out of bounds error

Sometimes the status gets updated before the queue has been retrieved.
In these cases we want to skip setting the current song until it has
been.

Persephone/State/Reducers/QueueReducer.swift

@@ -36,7 +36,7 @@ func queueReducer(action: Action, state: QueueState?) -> QueueState {
     if oldSongRowPos >= 0 {
       state.queue[oldSongRowPos].isPlaying = false
     }
-    if newSongRowPos >= 0 {
+    if newSongRowPos >= 0 && state.queue.count > newSongRowPos {
       state.queue[newSongRowPos].isPlaying = true
 
       DispatchQueue.main.async {