I help to run a five-a-side tournament with my scout group; we tend to have around 40 teams which split across 4 age groups. We can't run full round-robins at the group stage, so instead we run 4 games for each team, award points and put the best teams through to a knockout round.
The fixtures are all pre-arranged the day before, so if a team doesn't show up on the day it's sometimes not possible to avoid the situation where a bye has to be awarded to some of the teams.
In this situation, what's the correct score to award? We award 3 points for a win, 2 for a score draw and 1 for nil-nil. In practice goal difference often decides who goes through to the knockouts.
FWIW my own answer would probably be to award a score draw, which might avoid introducing an unfair advantage without penalising the team for missing a game?