[automerger] Return error for invalid st/lt sps parameters am: b93923e288 am: 797c104f3b am: 092cd28d04 am: 0e0458c8da am: 400d114e64 am: fa6d5fe71f am: 03831de632 am: 1a661cfc0e

Change-Id: Icc37d326fd7e42715275241dc0e373600d7fe236