Changing the challenge_or_404 call to make it more explicit and fix some bugs
Changing the challenge_or_404 call to make it more explicit and fix some bugs

osmlab/maproulette,osmlab/maproulette,Crashfreak/maproulette,mvexel/maproulette,Crashfreak/maproulette,mvexel/maproulette,osmlab/maproulette,mvexel/maproulette,mvexel/maproulette,osmlab/maproulette,Crashfreak/maproulette,mvexel/mr-tnav,mvexel/mr-tnav,Crashfreak/maproulette