Frances props were "injured" and all thier substiture props were "injured" too, so they had to play an uncontested scrum, its where the scrum forms but no pushing occurs.
Basically the All Black scrum was eating them for breakfast so they cheated - errr used the rules in a dodgey way - so they didn't need to contest in scrums. Its something a childrens side, or perhaps an old mans side does, not an international team.
They'll never hear the end of this, the entire french rugby team will be considered a pack of losers for doing this, even by their own countrymen. By the end of the match the commentators were saying things about the french forwards running up the white flag...