add test binding-SignalProducer object nil
add test binding-SignalProducer object nil

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estedman/ReactiveCocoa,chao95957/ReactiveCocoa,WEIBP/ReactiveCocoa,monkeydbobo/ReactiveCocoa,lixar/ReactiveCocoa,smilypeda/ReactiveCocoa,chao95957/ReactiveCocoa,brasbug/ReactiveCocoa,yangyangluoluo/ReactiveCocoa,tonyarnold/ReactiveCocoa,hbucius/ReactiveCocoa,wpstarnice/ReactiveCocoa,jaylib/ReactiveCocoa,leichunfeng/ReactiveCocoa,huiping192/ReactiveCocoa,AlanJN/ReactiveCocoa,howandhao/ReactiveCocoa,jeelun/ReactiveCocoa,stevielu/ReactiveCocoa,esttorhe/ReactiveCocoa,jsslai/ReactiveCocoa,SuPair/ReactiveCocoa,zhiwen1024/ReactiveCocoa,RuiAAPeres/ReactiveCocoa,qq644531343/ReactiveCocoa,Ray0218/ReactiveCocoa,cstars135/ReactiveCocoa,LHDsimon/ReactiveCocoa,cstars135/ReactiveCocoa,ceekayel/ReactiveCocoa,zxq3220122/ReactiveCocoa,yizzuide/ReactiveCocoa,ericzhou2008/ReactiveCocoa,xumaolin/ReactiveCocoa,richeterre/ReactiveCocoa,GuitarPlayer-Ma/ReactiveCocoa,mattpetters/ReactiveCocoa,ddc391565320/ReactiveCocoa,JohnJin007/ReactiveCocoa,yaoxiaoyong/ReactiveCocoa,ioshger0125/ReactiveCocoa,chieryw/ReactiveCocoa,qq644531343/ReactiveCocoa,Ricowere/ReactiveCocoa,SanChain/ReactiveCocoa,imkerberos/ReactiveCocoa,bscarano/ReactiveCocoa,stupidfive/ReactiveCocoa,jeelun/ReactiveCocoa,zhenlove/ReactiveCocoa,yangshengchaoios/ReactiveCocoa,CQXfly/ReactiveCocoa,jaylib/ReactiveCocoa,sdhzwm/ReactiveCocoa,DongDongDongDong/ReactiveCocoa