Don't allow user to re-enter walkthrough if already in walkthrough
Don't allow user to re-enter walkthrough if already in walkthrough

AndreasHae/iD,1ec5/iD,mapmeld/iD,digidem/iD,mapmeld/iD,bagage/iD,mapmeld/iD,1ec5/iD,kartta-labs/iD,ngageoint/hootenanny-ui,ngageoint/hootenanny-ui,kartta-labs/iD,ngageoint/hootenanny-ui,openstreetmap/iD,bagage/iD,1ec5/iD,bagage/iD,morray/iD,openstreetmap/iD,morray/iD,kartta-labs/iD,AndreasHae/iD,openstreetmap/iD,digidem/iD,AndreasHae/iD