fix bug: if test and sparse_remote_update can not co-exsit, crash trainer if necessary
fix bug: if test and sparse_remote_update can not co-exsit, crash trainer if necessary

livc/Paddle,yu239/Paddle,luotao1/Paddle,cxysteven/Paddle,Canpio/Paddle,PaddlePaddle/Paddle,livc/Paddle,wen-bo-yang/Paddle,putcn/Paddle,hedaoyuan/Paddle,QiJune/Paddle,gangliao/Paddle,QiJune/Paddle,putcn/Paddle,emailweixu/Paddle,livc/Paddle,pengli09/Paddle,gangliao/Paddle,tensor-tang/Paddle,jacquesqiao/Paddle,Canpio/Paddle,lcy-seso/Paddle,dayhaha/Paddle,Canpio/Paddle,yu239/Paddle,hedaoyuan/Paddle,lcy-seso/Paddle,yu239/Paddle,livc/Paddle,dayhaha/Paddle,luotao1/Paddle,putcn/Paddle,tensor-tang/Paddle,hedaoyuan/Paddle,wen-bo-yang/Paddle,reyoung/Paddle,wen-bo-yang/Paddle,tensor-tang/Paddle,Canpio/Paddle,dayhaha/Paddle,beckett1124/Paddle,cxysteven/Paddle,beckett1124/Paddle,wen-bo-yang/Paddle,baidu/Paddle,beckett1124/Paddle,yu239/Paddle,lispc/Paddle,pkuyym/Paddle,pkuyym/Paddle,gangliao/Paddle,emailweixu/Paddle,emailweixu/Paddle,beckett1124/Paddle,hedaoyuan/Paddle,pkuyym/Paddle,PaddlePaddle/Paddle,jacquesqiao/Paddle,livc/Paddle,gangliao/Paddle,luotao1/Paddle,lispc/Paddle,Canpio/Paddle,pengli09/Paddle,emailweixu/Paddle,tensor-tang/Paddle,chengduoZH/Paddle,PaddlePaddle/Paddle,lcy-seso/Paddle,emailweixu/Paddle,chengduoZH/Paddle,cxysteven/Paddle,dayhaha/Paddle,yu239/Paddle,pengli09/Paddle,baidu/Paddle,luotao1/Paddle,QiJune/Paddle,chengduoZH/Paddle,dayhaha/Paddle,lcy-seso/Paddle,pengli09/Paddle,wen-bo-yang/Paddle,jacquesqiao/Paddle,Canpio/Paddle,wen-bo-yang/Paddle,Canpio/Paddle,pkuyym/Paddle,cxysteven/Paddle,luotao1/Paddle,lispc/Paddle,QiJune/Paddle,beckett1124/Paddle,beckett1124/Paddle,Canpio/Paddle,luotao1/Paddle,hedaoyuan/Paddle,QiJune/Paddle,tensor-tang/Paddle,gangliao/Paddle,QiJune/Paddle,baidu/Paddle,pkuyym/Paddle,cxysteven/Paddle,pkuyym/Paddle,putcn/Paddle,lispc/Paddle,luotao1/Paddle,lcy-seso/Paddle,jacquesqiao/Paddle,hedaoyuan/Paddle,wen-bo-yang/Paddle,PaddlePaddle/Paddle,gangliao/Paddle,lispc/Paddle,putcn/Paddle,yu239/Paddle,pengli09/Paddle,baidu/Paddle,cxysteven/Paddle,chengduoZH/Paddle,hedaoyuan/Paddle,emailweixu/Paddle,dayhaha/Paddle,jacquesqiao/Paddle,reyoung/Paddle,lispc/Paddle,livc/Paddle,yu239/Paddle,yu239/Paddle,pengli09/Paddle,lispc/Paddle,baidu/Paddle,reyoung/Paddle,hedaoyuan/Paddle,gangliao/Paddle,PaddlePaddle/Paddle,pengli09/Paddle,chengduoZH/Paddle,pengli09/Paddle,PaddlePaddle/Paddle,reyoung/Paddle,lcy-seso/Paddle,cxysteven/Paddle,livc/Paddle,jacquesqiao/Paddle,emailweixu/Paddle,putcn/Paddle,lispc/Paddle,reyoung/Paddle,PaddlePaddle/Paddle,beckett1124/Paddle,reyoung/Paddle,dayhaha/Paddle