BUG: Do not update last price if price is nan.
BUG: Do not update last price if price is nan.

Scapogo/zipline,enigmampc/catalyst,erikness/AlephOne,umuzungu/zipline,humdings/zipline,bartosh/zipline,michaeljohnbennett/zipline,StratsOn/zipline,jordancheah/zipline,AlirezaShahabi/zipline,joequant/zipline,alphaBenj/zipline,nborggren/zipline,magne-max/zipline-ja,dkushner/zipline,stkubr/zipline,otmaneJai/Zipline,sketchytechky/zipline,ChinaQuants/zipline,aajtodd/zipline,kmather73/zipline,gwulfs/zipline,semio/zipline,morrisonwudi/zipline,quantopian/zipline,grundgruen/zipline,nborggren/zipline,dkushner/zipline,zhoulingjun/zipline,MonoCloud/zipline,jimgoo/zipline-fork,davidastephens/zipline,YuepengGuo/zipline,YuepengGuo/zipline,mattcaldwell/zipline,florentchandelier/zipline,ronalcc/zipline,MonoCloud/zipline,gwulfs/zipline,wilsonkichoi/zipline,alphaBenj/zipline,florentchandelier/zipline,ChinaQuants/zipline,stkubr/zipline,humdings/zipline,grundgruen/zipline,StratsOn/zipline,ronalcc/zipline,zhoulingjun/zipline,cmorgan/zipline,davidastephens/zipline,DVegaCapital/zipline,wilsonkichoi/zipline,euri10/zipline,bartosh/zipline,iamkingmaker/zipline,dmitriz/zipline,erikness/AlephOne,dhruvparamhans/zipline,michaeljohnbennett/zipline,mattcaldwell/zipline,CDSFinance/zipline,AlirezaShahabi/zipline,jimgoo/zipline-fork,wubr2000/zipline,keir-rex/zipline,otmaneJai/Zipline,CarterBain/AlephNull,Scapogo/zipline,enigmampc/catalyst,chrjxj/zipline,CarterBain/AlephNull,quantopian/zipline,jordancheah/zipline,DVegaCapital/zipline,aajtodd/zipline,morrisonwudi/zipline,chrjxj/zipline,joequant/zipline,magne-max/zipline-ja,euri10/zipline,keir-rex/zipline,iamkingmaker/zipline,cmorgan/zipline,kmather73/zipline,sketchytechky/zipline,wubr2000/zipline,dmitriz/zipline,umuzungu/zipline,CDSFinance/zipline,dhruvparamhans/zipline,semio/zipline