BUG: Avoid NOT NULL violation by checking for data first
BUG: Avoid NOT NULL violation by checking for data first

CDSFinance/zipline,grundgruen/zipline,jimgoo/zipline-fork,umuzungu/zipline,Scapogo/zipline,jimgoo/zipline-fork,otmaneJai/Zipline,umuzungu/zipline,grundgruen/zipline,alphaBenj/zipline,YuepengGuo/zipline,dmitriz/zipline,enigmampc/catalyst,michaeljohnbennett/zipline,magne-max/zipline-ja,MonoCloud/zipline,florentchandelier/zipline,ChinaQuants/zipline,chrjxj/zipline,chrjxj/zipline,Scapogo/zipline,MonoCloud/zipline,magne-max/zipline-ja,enigmampc/catalyst,nborggren/zipline,michaeljohnbennett/zipline,dmitriz/zipline,wilsonkichoi/zipline,wilsonkichoi/zipline,CDSFinance/zipline,bartosh/zipline,florentchandelier/zipline,otmaneJai/Zipline,alphaBenj/zipline,humdings/zipline,nborggren/zipline,quantopian/zipline,sketchytechky/zipline,YuepengGuo/zipline,quantopian/zipline,humdings/zipline,ChinaQuants/zipline,sketchytechky/zipline,bartosh/zipline