set second parameter default to {} in  think.parseConfig method when invoke parser
set second parameter default to {} in  think.parseConfig method when invoke parser

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