Default predef values to false.
Default predef values to false.

Fixes GH-800.

SqrTT/dwhint,BridgeAR/jshint,mcanthony/jshint,fairfieldt/jshint,nitinlal/jshint,kidaa/jshint,laurensortiz/jshint,Joy603/jshint,ghtest712/bearded-octo-dangerzone,max789/jshint,thomas658/jshint,Jeremy017/jshint,BridgeAR/jshint,elkingtonmcb/jshint,ljharb/jshint,gameclosure/jsiohint,louwers/jshint,jonnyreeves/jshint,supriyantomaftuh/jshint,paul-wade/jshint,freeyiyi1993/jshint,pansay/jshint,goatslacker/jshint,lukeapage/jshint,scottsmeester/jshint,fashionsun/jshint,yadimon/jshint,supriyantomaftuh/jshint,AndriiGro/jshint,AndriiGro/jshint,wzup/jshint,mcanthony/jshint,llucbrell/jshint,cnbin/jshint,ThiagoGarciaAlves/jshint,kidaa/jshint,kangax/jshint,fashionsun/jshint,jshint/jshint,nicolo-ribaudo/jshint,gloryknight/jshint,aisk/jshint,beni55/jshint,elkingtonmcb/jshint,louwers/jshint,zynick/jshint,nicolo-ribaudo/jshint,alivesay/jshint,gtanner/jshint,shreyasgaonkar/jshint,lovemeblender/jshint,Endika/jshint,yyx990803/jshint,rwaldron/jshint,stevemao/jshint,wisavalite/jshint,jagdeesh109/jshint,behind2/jshint,niedzielski/jshint,aisk/jshint,lukeapage/jshint,paragag/AntiRedis,n8io/jshint,wisavalite/jshint,wzup/jshint,luisbrito/jshint,cnbin/jshint,doggy8088/jshint,pansay/jshint,davidjb/jshint,raix/jshint,Joy603/jshint,Jeremy017/jshint,yadimon/jshint,freeyiyi1993/jshint,mohsen1/jshint,niedzielski/jshint,luisbrito/jshint,crivas/jshint,mohsen1/jshint,doggy8088/jshint,llucbrell/jshint,ljharb/jshint,jugglinmike/jshint,laurensortiz/jshint,jugglinmike/jshint,mrjoelkemp/jshint,paul-wade/jshint,ecomfe/edp-jshint,n8io/jshint,thomas658/jshint,behind2/jshint,max789/jshint,gtanner/jshint,marian-r/jshint,jshint/jshint,darongE/jshint,nitinlal/jshint,shreyasgaonkar/jshint,marian-r/jshint,mrjoelkemp/jshint,beni55/jshint,scottsmeester/jshint,davidjb/jshint,crivas/jshint,alivesay/jshint,jagdeesh109/jshint,stevemao/jshint,silverwind/jshint,paladox/jshint,Khan/jshint,Endika/jshint,meh-uk/jshint