save 'None' ytransform as empty string instead of null
save 'None' ytransform as empty string instead of null

ual/urbansim,SANDAG/urbansim,SANDAG/urbansim,SANDAG/urbansim,apdjustino/urbansim,UDST/urbansim,AZMAG/urbansim,bricegnichols/urbansim,VladimirTyrin/urbansim,bricegnichols/urbansim,apdjustino/urbansim,apdjustino/urbansim,AZMAG/urbansim,UDST/urbansim,ual/urbansim,ual/urbansim,waddell/urbansim,waddell/urbansim,bricegnichols/urbansim,UDST/urbansim,ual/urbansim,AZMAG/urbansim,synthicity/urbansim,synthicity/urbansim,AZMAG/urbansim,synthicity/urbansim,apdjustino/urbansim,VladimirTyrin/urbansim,waddell/urbansim,VladimirTyrin/urbansim,VladimirTyrin/urbansim,UDST/urbansim,waddell/urbansim,bricegnichols/urbansim,SANDAG/urbansim,synthicity/urbansim