Fix TypeError from race condition between resetting and using transforms.
Fix TypeError from race condition between resetting and using
transforms.

AndreasHae/iD,kepta/iD,mapmeld/iD,1ec5/iD,openstreetmap/iD,bagage/iD,ngageoint/hootenanny-ui,andreic-telenav/iD,openstreetmap/iD,tbicr/iD,mapmeld/iD,mapmeld/iD,ngageoint/hootenanny-ui,bagage/iD,AndreasHae/iD,kartta-labs/iD,tbicr/iD,kartta-labs/iD,digidem/iD,energiekollektiv/openmod.sh-id,andreic-telenav/iD,1ec5/iD,edpop/iD,bagage/iD,edpop/iD,openstreetmap/iD,AndreasHae/iD,ngageoint/hootenanny-ui,1ec5/iD,edpop/iD,kartta-labs/iD,morray/iD,zbycz/iD,zbycz/iD,kepta/iD,morray/iD,digidem/iD,energiekollektiv/openmod.sh-id