Im too lazy to login to get pix but when you go to kill the dragon, youll see that there wont be no dragon and youll see my tactical piston / lever that i used to get the egg :>
Edit: I soloed him, was piss easy. I went from lvl 23 to 79 and I never lost more than 3 hearts at the most (this damage was mostly done by the endermen). The dragons' most deadly trick is when he hits you and you can fly off the island to the endless dark. I almost fell