Ted Knight, we now know, was typecast as a dumb buffoon with Phil Donahue hair in The Mary Tyler Moore Show. In his own sitcom, he's still playing the buffoon. The viewing public grew tired of watching him on ABC last September and Comfort was canceled, but Knight and company put together a syndicate of independent stations and the show goes on. Unfortunately. Knight plays Henry Rush, cartoonist and creator of "Cosmic Cow." Nancy (Good Morning America) Dussault is his wife; Deborah Van Valkenburgh is his smart daughter and Lydia Cornell is his dumb, blond, bimbo, chip-off-the-old-block daughter. The plots could be rejects from Three's Company. The writing and acting are plain painful. Comfort deserved cancelation. If networks are desperate for good shows (and they are), then independent stations must be even more desperate to run this.