[automerger] Return error for invalid st/lt sps parameters am: b93923e288 am: 797c104f3b am: 092cd28d04 am: 0e0458c8da am: 400d114e64 am: fa6d5fe71f am: 03831de632

Change-Id: I54eb92ff1295f6b7a5feb35ec237f836e987871e