Fix aggregate method return error value in mongo model
Fix aggregate method return error value in mongo model

75team/thinkjs,thinkjs/thinkjs,75team/thinkjs,75team/thinkjs,akira-cn/thinkjs,akira-cn/thinkjs,Qihoo360/thinkjs,akira-cn/thinkjs,maxzhang/thinkjs,maxzhang/thinkjs,maxzhang/thinkjs,snadn/thinkjs