The only Johnny-on-the-spot among the nominees announced last week for the 18th annual Sports Emmy Awards (to be awarded April 23) was NBC golf analyst Johnny Miller. Kudos to Miller, who deserves recognition. But what about Jon Miller, ESPN's smooth baseball play-by-play man? And John McEnroe. CBS- NBC- USA's opinionated (and usually correct) tennis analyst? Most inexcusable was the omission of Fox NFL analyst John Madden. As for Johns not nominated, thank heaven for small favors: NBC Olympic gymnastics host John Tesh didn't get the call.