I completed the weekly nightfall yesterday and received no rewards. Just before we were to hit orbit, after completing the nightfall, I got a connection problem message and the reward screen showed nothing for me, a few minutes later I was disconnected from the server. I logged out and back in and confirmed that I received the weekly nightfall buff but no rewards or experience was awarded. I also checked my in-game mail but it was empty. This was the first and only attempt on this week's nightfall.