MOTD might have explained it that way but in law that is wrong. The free kick is supposed to be an advantage to the fouled team. If the whistle goes it does not really matter if the keeper is ready or not. Before ko the ref will normally tell the players that if they want to take a quick free kick, then do so, as long as the ref hasn't asked them to wait for the whistle. Dunk has said that Mason told him he blew the 2nd time as there was pushing in the wall. Now under the new rules none of the attackers should be close enough to push anyone in the wall. If they had then surely it would have been a free kick to WBA as the ball is in play from the 1st whistle, but he gave a re take.
The likes of Lee Mason give all refs a bad name.