pkg/report: add nil checking for getTimeSeries
pkg/report: add nil checking for getTimeSeries

insequent/etcd,rnaveiras/etcd,vimalk78/etcd,ravigadde/etcd,lorneli/etcd,handsomesun/etcd,li-ang/etcd,handsomesun/etcd,whuwxl/etcd,heyitsanthony/etcd,tguangch/etcd,mqliang/etcd,YuleiXiao/etcd,CrazyJvm/etcd,whuwxl/etcd,sebrandon1/etcd,lumjjb/etcd,glevand/coreos--etcd,sinsharat/etcd,rnaveiras/etcd,etcd-io/etcd,bdarnell/etcd,cockroachdb/etcd,a-robinson/etcd,coreos/etcd,armstrongli/etcd,jlamillan/etcd,gyuho/etcd,joshix/etcd,a-robinson/etcd,mickep76/etcd,mqliang/etcd,coreos/etcd,li-ang/etcd,sebrandon1/etcd,xiang90/etcd,dannysauer/etcd,cockroachdb/etcd,xiang90/etcd,bluebreezecf/etcd,akauppi/etcd,fanminshi/etcd,akauppi/etcd,YuleiXiao/etcd,glevand/coreos--etcd,mickep76/etcd,visheshnp/etcd,ajityagaty/etcd,lumjjb/etcd,etcd-io/etcd,ajityagaty/etcd,heyitsanthony/etcd,mkumatag/etcd,yudai/etcd,tguangch/etcd,etcd-io/etcd,lorneli/etcd,bdarnell/etcd,plasticbox/etcd,armstrongli/etcd,rnaveiras/etcd,gyuho/etcd,mkumatag/etcd,dannysauer/etcd,ravigadde/etcd,visheshnp/etcd,fanminshi/etcd,CrazyJvm/etcd,insequent/etcd,yudai/etcd,plasticbox/etcd,mqliang/etcd,joshix/etcd,sinsharat/etcd,mkumatag/etcd,jlamillan/etcd,vimalk78/etcd,bluebreezecf/etcd,ajityagaty/etcd