avoid error when user not found (presumably due to account deletion request)
Distrochess is distributed chess. This means that you don't play a single game against a single person -- you play many games against many other users. It's a bit like a simultaneous match, but instead of many people playing against a single opponent, there are several players on each side of the table.
After you make a move, that game is placed back on the queue so that another user can have an opportunity to respond. Meanwhile, you will be given a random game off the queue. In order to avoid players playing against themselves, each player always plays the same side of a given game.
