Fix：本地路径不存在时，mui.ajax()方法依然触发成功回调的bug；
Fix：本地路径不存在时，mui.ajax()方法依然触发成功回调的bug；

miu-wen/mui,coffeefuture/mui,miu-wen/mui,MoGaven/mui,dcloudio/mui,coffeefuture/mui,phillyx/mui,phillyx/mui,webcoding/mui,MoGaven/mui,miu-wen/mui,dcloudio/mui,dcloudio/mui,MoGaven/mui,webcoding/mui,webcoding/mui