bugfix: play prev&next's broken

tower: https://tower.im/projects/d4e0ff64158645f28d99a9ca72d0c27b/todos/ede9b70538c34494ad90833d90a37d45/

bugfix: prev&next is broken if the player encountered a broken
video file.

Change-Id: If8cc9cf8a196686268ef04ca096482a8875d7dcb