Remove unnecessary nil check.
Remove unnecessary nil check.

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activeCocoa,Khan/ReactiveCocoa,KJin99/ReactiveCocoa,monkeydbobo/ReactiveCocoa,icepy/ReactiveCocoa,loupman/ReactiveCocoa,zhaoguohui/ReactiveCocoa,KJin99/ReactiveCocoa,BrooksWon/ReactiveCocoa,jaylib/ReactiveCocoa,OnTheWay1988/ReactiveCocoa,xiaoliyang/ReactiveCocoa,itschaitanya/ReactiveCocoa,Rupert-RR/ReactiveCocoa,fanghao085/ReactiveCocoa,zzzworm/ReactiveCocoa,JackLian/ReactiveCocoa,BlessNeo/ReactiveCocoa,leelili/ReactiveCocoa,Farteen/ReactiveCocoa,terry408911/ReactiveCocoa,cnbin/ReactiveCocoa,longv2go/ReactiveCocoa,Ricowere/ReactiveCocoa,zxq3220122/ReactiveCocoa,WEIBP/ReactiveCocoa,AndyZhaoHe/ReactiveCocoa,walkingsmarts/ReactiveCocoa,mxxiv/ReactiveCocoa,isghe/ReactiveCocoa,howandhao/ReactiveCocoa,emodeqidao/ReactiveCocoa,OneSmallTree/ReactiveCocoa,natestedman/ReactiveCocoa,SanChain/ReactiveCocoa,jaylib/ReactiveCocoa,jackywpy/ReactiveCocoa,wangqi211/ReactiveCocoa,PSPDFKit-labs/ReactiveCocoa,OneSmallTree/ReactiveCocoa,BlessNeo/ReactiveCocoa,jianwoo/ReactiveCocoa,jam891/ReactiveCocoa,shaohung001/ReactiveCocoa,xiaobing2007/ReactiveCocoa,brasbug/ReactiveCocoa,taylormoonxu/ReactiveCocoa,yizzuide/ReactiveCocoa,terry408911/ReactiveCocoa,leelili/ReactiveCocoa,Juraldinio/ReactiveCocoa,leichunfeng/ReactiveCocoa,juliangrosshauser/ReactiveCocoa,goodheart/ReactiveCocoa,zzzworm/ReactiveCocoa,LHDsimon/ReactiveCocoa,valleyman86/ReactiveCocoa,ddc391565320/ReactiveCocoa,sujeking/ReactiveCocoa,jsslai/ReactiveCocoa,alvinvarghese/ReactiveCocoa,yizzuide/ReactiveCocoa,stevielu/ReactiveCocoa,fanghao085/ReactiveCocoa,Juraldinio/ReactiveCocoa,llb1119/test,eyu1988/ReactiveCocoa,natan/ReactiveCocoa,sujeking/ReactiveCocoa,jrmiddle/ReactiveCocoa,ikesyo/ReactiveCocoa,bensonday/ReactiveCocoa,yaoxiaoyong/ReactiveCocoa,Carthage/ReactiveCocoa,zhiwen1024/ReactiveCocoa,icepy/ReactiveCocoa,Eveian/ReactiveCocoa,koamac/ReactiveCocoa,CCOOOOLL/ReactiveCocoa,hoanganh6491/ReactiveCocoa,AndyZhaoHe/ReactiveCocoa,tonyarnold/ReactiveCocoa,mattpetters/ReactiveCocoa,icepy/ReactiveCocoa,loupman/ReactiveCocoa,zhigang1992/ReactiveCocoa