[PrintAsObjC] Don't include the module for empty extensions
[PrintAsObjC] Don't include the module for empty extensions

rdar://problem/57133517

benlangmuir/swift,xwu/swift,xwu/swift,CodaFi/swift,ahoppen/swift,stephentyrone/swift,tkremenek/swift,apple/swift,JGiola/swift,atrick/swift,jmgc/swift,ahoppen/swift,jmgc/swift,parkera/swift,rudkx/swift,apple/swift,tkremenek/swift,benlangmuir/swift,tkremenek/swift,hooman/swift,atrick/swift,CodaFi/swift,stephentyrone/swift,glessard/swift,tkremenek/swift,glessard/swift,xwu/swift,CodaFi/swift,stephentyrone/swift,parkera/swift,nathawes/swift,nathawes/swift,rudkx/swift,stephentyrone/swift,rudkx/swift,tkremenek/swift,harlanhaskins/swift,jckarter/swift,jmgc/swift,gregomni/swift,allevato/swift,jckarter/swift,aschwaighofer/swift,apple/swift,JGiola/swift,hooman/swift,aschwaighofer/swift,rudkx/swift,jckarter/swift,aschwaighofer/swift,gregomni/swift,atrick/swift,xwu/swift,xwu/swift,benlangmuir/swift,allevato/swift,benlangmuir/swift,tkremenek/swift,ahoppen/swift,harlanhaskins/swift,tkremenek/swift,rudkx/swift,roambotics/swift,aschwaighofer/swift,jckarter/swift,airspeedswift/swift,xwu/swift,airspeedswift/swift,CodaFi/swift,CodaFi/swift,apple/swift,JGiola/swift,jckarter/swift,parkera/swift,nathawes/swift,allevato/swift,jckarter/swift,harlanhaskins/swift,parkera/swift,roambotics/swift,CodaFi/swift,glessard/swift,apple/swift,parkera/swift,nathawes/swift,jmgc/swift,harlanhaskins/swift,gregomni/swift,allevato/swift,airspeedswift/swift,JGiola/swift,jmgc/swift,CodaFi/swift,gregomni/swift,roambotics/swift,jmgc/swift,airspeedswift/swift,ahoppen/swift,gregomni/swift,stephentyrone/swift,hooman/swift,nathawes/swift,atrick/swift,gregomni/swift,parkera/swift,hooman/swift,atrick/swift,jckarter/swift,apple/swift,airspeedswift/swift,glessard/swift,hooman/swift,roambotics/swift,jmgc/swift,ahoppen/swift,harlanhaskins/swift,parkera/swift,aschwaighofer/swift,nathawes/swift,benlangmuir/swift,parkera/swift,roambotics/swift,airspeedswift/swift,airspeedswift/swift,harlanhaskins/swift,roambotics/swift,allevato/swift,glessard/swift,xwu/swift,benlangmuir/swift,harlanhaskins/swift,hooman/swift,JGiola/swift,nathawes/swift,allevato/swift,glessard/swift,aschwaighofer/swift,stephentyrone/swift,aschwaighofer/swift,stephentyrone/swift,JGiola/swift,ahoppen/swift,atrick/swift,hooman/swift,rudkx/swift,allevato/swift