correction to null check
correction to null check

covers cases where the object is NSNull, but not nil. NSNull != nil

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