BUG: Handle a ValueError on from_csv calls
BUG: Handle a ValueError on from_csv calls

The cached market data could be corrupted. Pandas raises a ValueError in
that case, and this error handles it.

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