Forum:Light and Darkness Dragon Text HELP!!!

I know the general rulings and effects in and out with LaDD, but an opponent of mine has recently brought up an argument that made me second guess myself. Here is the situation.

I control a face up LaDD and NO OTHER CARDS.

My opponent destroys my LaDD in battle.

I attempt to summon a monster but my opponent says i am unable too and quotes this line from the card text:

" When this card is destroyed and sent to the Graveyard, select 1 monster in your Graveyard. Then destroy all cards you control, and Special Summon that monster."

My opponent claims since i don't have at least 1 card that i control that will be destroyed by LaDD 3rd effect, I can't Special Summon a monster. By what the card text says, isn't my opponent right? Do I need to have a card(s) to destroy for LaDD 3rd effect to resolve (because it's a trigger and activates regardless if I can special summon a monster or not)?