BUG Special case for when only drawdown occurs.
BUG Special case for when only drawdown occurs.

yanheven/pyfolio,ChinaQuants/pyfolio,YihaoLu/pyfolio,sketchytechky/pyfolio,ChinaQuants/pyfolio,quantopian/pyfolio,femtotrader/pyfolio,raybuhr/pyfolio,raybuhr/pyfolio,r0k3/pyfolio,YihaoLu/pyfolio,quantopian/pyfolio,sketchytechky/pyfolio,dursk/pyfolio,femtotrader/pyfolio,r0k3/pyfolio,yanheven/pyfolio,chayapan/pyfolio,dursk/pyfolio