Everyone has the right to resign any of their games at any point - it is as legitimate an option as moving a piece or offering a draw, so there should not be a policy to deal with it.
I've been affected by this once because I played my games quickly against the top-rated opponent in a tourney and got one draw one loss. He then mass-resigned and one of the guys who got 2 points for free just beat me to third place. Hey ho, that's part of the game.
I don't think you can nullify any games because it would have a knock-on effect on ratings against anyone who played this player and anyone who played them etc.
I'm not suggesting that rating changes get rolled back -- just tournament results from the current round.
I would agree with that... the whole round against that player should be nullified for the purposes of the tournament.
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