Handle !start <preset> gracefully in game_setup

gameloop.py

@@ -381,7 +381,10 @@ def game(send, notice, voice, devoice, get_event):
 					send('Game setup, waiting for %s to be ready' % ', '.join(i.nick for i in players_unready))
 
 			elif event == events.start:
-				break
+				if len(args) == 1:
+					break
+				else:
+					send('Can\'t apply presets once the game setup has started. Here !start begins the game without waiting for !ready')
 
 			elif event == events.ready:
 				nick, = args