re the OP - ALL the landing lights were inop, and you were released for a night flight???
I don't have access to an A320 MMEL (TC hasn't put the airbus MMELs online yet) but a quick check of ours indicates that all lights inop is only permitted as follows:
All may be inoperative provided aircraft is not operated at night.
I'm a bit perplexed that anyone managed to get all the lights inop onto the MEL.... if I read your post correctly.