Disconnected from remote media player api when no other media player api is available causes unexpected behavior

[AngelJedi]

• I have verified there are no duplicate active or recent bugs, questions, or requests

Include the following:

• PlaylistCore version: 2.0.0
• Device OS version: 8.1..0
• Devide Manufacturer: Google
• Device Name: Pixel 2 XL

Reproduction Steps

0. Disconnect from a remote media player api while no other player api is available

Expected Result

The service should shut down as there is no way to play media.

Actual Result

Media playback stops, but the service is still running and the media notification is still visible, though none of the controls do anything.

Other Information

This appears to be happening because the updateCurrentMediaPlayer() method in the DefaultPlaylistHandler sets the currentMediaPlayer = null and then calls play(), which just returns false because the player is null.

It appears, though this was not my scenario, that the same thing would happen if I did have other players registered that can't handle playback of the item too.