handle 'None' cuts and drill downs. 
handle 'None' cuts and drill downs. 
nathanhilbert/FPA_Core,CivicVision/datahub,USStateDept/FPA_Core,spendb/spendb,openspending/spendb,openspending/spendb,nathanhilbert/FPA_Core,johnjohndoe/spendb,pudo/spendb,pudo/spendb,spendb/spendb,USStateDept/FPA_Core,CivicVision/datahub,spendb/spendb,openspending/spendb,nathanhilbert/FPA_Core,johnjohndoe/spendb,USStateDept/FPA_Core,pudo/spendb,johnjohndoe/spendb,CivicVision/datahub