It’s not the most encouraging move a network can make, but ordering more scripts is better than the ultimate alternative: cancellation. That seems to be what both “Knight Rider” and “Terminator: The Sarah Connor Chronicles” are trying to stave off despite lower-than-anticipated ratings and a mostly hushed reaction from the networks. However, NBC has ordered an additional four scripts of “Knight Rider,” trade publication Variety says, while reports are out that two more scripts have been ordered by Fox for “Sarah Connor,” a show that is considered to be on the brink of cancellation. Fox made the move to order more “Sarah Connor” scripts despite already ordering a full season pickup for freshman drama “Fringe” and canceling the comedy “Do Not Disturb.” Script ordering is usually …