Los Angeles police have arrested two teenagers and recovered a laptop computer which was stolen from the attorney representing actor Robert Blake in his murder trial. The theft of the computer caused a delay in the Dec. 13 start of Blake's trial for the murder of his wife Bonny Lee Bakley. In spite of speculation to the contrary, the theft had nothing to do with the case, police said. The trial has been rescheduled to begin Monday, Dec. 20.