added demo on how to check for successful JSON fetch
added demo on how to check for successful JSON fetch

MaWenxing/JSONModel,icanzilb/JSONModel,AlJaMa/JSONModel,redlinesolutions/JSONModel,SummerHF/JSONModel,liwangbest/JSONModel,CareEvolution/JSONModel,TerryAsh/JSONModel,hfossli/JSONModel,jianwoo/JSONModel,huiping192/JSONModel,NiuMengFei/JSONModel,youprofit/JSONModel,zwcshy/JSONModel,db42/JSONModel,cczallen/JSONModel,yunzhongyoulong/JSONModel,LiuShulong/JSONModel,jsonmodel/jsonmodel,ThirakornP/JSONModel,iwakevin/JSONModel,billinghamj/JSONModel,xunan623/JSONModel,dbachrach/JSONModel,SanjoDeundiak/JSONModel,izrie/JSONModel,kerrmarin/jsonmodel,SatanWoo/JSONModel,xxclouddd/JSONModel,MellongLau/JSONModel,ernestopino/JSONModel,liuyujing/JSONModel,chenkaige/JSONModel,ramoslin02/JSONModel,SampleLiao/JSONModel,billinghamj/JSONModel,zwcshy/JSONModel,johnmyqin/JSONModel,jianwoo/JSONModel,yarec/JSONModel,dalu93/JSONModel,zhou18520786640/JSONModel,scottdinggo/JSONModel,SongYuJie1989/JSONModel