Fixes false error when a preset inherits fields from a preset with no fields
Fixes false error when a preset inherits fields from a preset with no fields

AndreasHae/iD,openstreetmap/iD,morray/iD,morray/iD,kartta-labs/iD,AndreasHae/iD,openstreetmap/iD,digidem/iD,AndreasHae/iD,kartta-labs/iD,digidem/iD,openstreetmap/iD,kartta-labs/iD