Update SceneKit test for nullability change
Update SceneKit test for nullability change

Changed to nullable in new SDK.

Swift SVN r31016

emilstahl/swift,aschwaighofer/swift,ken0nek/swift,alblue/swift,karwa/swift,Ivacker/swift,sschiau/swift,xwu/swift,deyton/swift,ben-ng/swift,gribozavr/swift,gottesmm/swift,zisko/swift,austinzheng/swift,practicalswift/swift,kstaring/swift,swiftix/swift.old,Ivacker/swift,ben-ng/swift,brentdax/swift,KrishMunot/swift,IngmarStein/swift,mightydeveloper/swift,jtbandes/swift,uasys/swift,shajrawi/swift,cbrentharris/swift,jmgc/swift,johnno1962d/swift,CodaFi/swift,sschiau/swift,aschwaighofer/swift,djwbrown/swift,russbishop/swift,swiftix/swift.old,deyton/swift,amraboelela/swift,natecook1000/swift,jtbandes/swift,adrfer/swift,IngmarStein/swift,parkera/swift,felix91gr/swift,huonw/swift,djwbrown/swift,therealbnut/swift,swiftix/swift,shahmishal/swift,tinysun212/swift-windows,practicalswift/swift,calebd/swift,harlanhaskins/swift,codestergit/swift,tkremenek/swift,kperryua/swift,huonw/swift,glessard/swift,karwa/swift,xwu/swift,codestergit/swift,danielmartin/swift,mightydeveloper/swift,manavgabhawala/swift,benlangmuir/swift,Jnosh/swift,IngmarStein/swift,alblue/swift,parkera/swift,emilstahl/swift,lorentey/swift,slavapestov/swift,tjw/swift,OscarSwanros/swift,ken0nek/swift,JaSpa/swift,harlanhaskins/swift,johnno1962d/swift,rudkx/swift,tardieu/swift,shajrawi/swift,alblue/swift,adrfer/swift,stephentyrone/swift,glessard/swift,hughbe/swift,shajrawi/swift,kstaring/swift,apple/swift,hooman/swift,JGiola/swift,JGiola/swift,gregomni/swift,SwiftAndroid/swift,adrfer/swift,jmgc/swift,amraboelela/swift,slavapestov/swift,allevato/swift,huonw/swift,modocache/swift,therealbnut/swift,SwiftAndroid/swift,ken0nek/swift,IngmarStein/swift,slavapestov/swift,sdulal/swift,practicalswift/swift,kperryua/swift,apple/swift,swiftix/swift.old,rudkx/swift,nathawes/swift,tjw/swift,devincoughlin/swift,MukeshKumarS/Swift,tardieu/swift,tardieu/swift,austinzheng/swift,LeoShimonaka/swift,arvedviehweger/swift,stephentyrone/swift,JGiola/swift,hooman/swift,return/swift,hughbe/swift,xwu/swift,kentya6/swift,LeoShimonaka/swift,xedin/swift,CodaFi/swift,djwbrown/swift,kentya6/swift,felix91gr/swift,allevato/swift,swiftix/swift.old,austinzheng/swift,SwiftAndroid/swift,Jnosh/swift,glessard/swift,alblue/swift,jopamer/swift,amraboelela/swift,kperryua/swift,felix91gr/swift,LeoShimonaka/swift,gmilos/swift,gribozavr/swift,kentya6/swift,jtbandes/swift,parkera/swift,ben-ng/swift,slavapestov/swift,sdulal/swift,felix91gr/swift,codestergit/swift,jckarter/swift,jtbandes/swift,return/swift,therealbnut/swift,johnno1962d/swift,mightydeveloper/swift,gottesmm/swift,cbrentharris/swift,gribozavr/swift,devincoughlin/swift,lorentey/swift,MukeshKumarS/Swift,huonw/swift,tjw/swift,JaSpa/swift,slavapestov/swift,dduan/swift,nathawes/swift,dduan/swift,lorentey/swift,aschwaighofer/swift,LeoShimonaka/swift,jopamer/swift,gmilos/swift,gribozavr/swift,nathawes/swift,gribozavr/swift,jckarter/swift,apple/swift,xedin/swift,felix91gr/swift,sschiau/swift,uasys/swift,harlanhaskins/swift,ahoppen/swift,shahmishal/swift,nathawes/swift,bitjammer/swift,rudkx/swift,tinysun212/swift-windows,djwbrown/swift,adrfer/swift,slavapestov/swift,parkera/swift,khizkhiz/swift,JGiola/swift,therealbnut/swift,milseman/swift,mightydeveloper/swift,kusl/swift,MukeshKumarS/Swift,tinysun212/swift-windows,SwiftAndroid/swift,parkera/swift,natecook1000/swift,OscarSwanros/swift,lorentey/swift,sdulal/swift,jckarter/swift,devincoughlin/swift,allevato/swift,uasys/swift,sdulal/swift,dduan/swift,kentya6/swift,russbishop/swift,alblue/swift,hooman/swift,slavapestov/swift,emilstahl/swift,xedin/swift,Ivacker/swift,emilstahl/swift,Ivacker/swift,ken0nek/swift,brentdax/swift,devincoughlin/swift,johnno1962d/swift,hughbe/swift,danielmartin/swift,tkremenek/swift,jmgc/swift,Ivacker/swift,roambotics/swift,zisko/swift,therealbnut/swift,shahmishal/swift,karwa/swift,xwu/swift,calebd/swift,gmilos/swift,russbishop/swift,harlanhaskins/swift,OscarSwanros/swift,felix91gr/swift,tkremenek/swift,jmgc/swift,stephentyrone/swift,uasys/swift,CodaFi/swift,return/swift,kusl/swift,ken0nek/swift,uasys/swift,ahoppen/swift,practicalswift/swift,stephentyrone/swift,swiftix/swift,jopamer/swift,allevato/swift,gottesmm/swift,natecook1000/swift,Ivacker/swift,tkremenek/swift,KrishMunot/swift,adrfer/swift,gottesmm/swift,brentdax/swift,felix91gr/swift,codestergit/swift,cbrentharris/swift,CodaFi/swift,kperryua/swift,return/swift,codestergit/swift,MukeshKumarS/Swift,calebd/swift,devincoughlin/swift,Jnosh/swift,milseman/swift,cbrentharris/swift,apple/swift,cbrentharris/swift,SwiftAndroid/swift,jopamer/swift,aschwaighofer/swift,glessard/swift,JaSpa/swift,kusl/swift,swiftix/swift,kusl/swift,khizkhiz/swift,khizkhiz/swift,jopamer/swift,gottesmm/swift,benlangmuir/swift,swiftix/swift.old,benlangmuir/swift,sdulal/swift,airspeedswift/swift,modocache/swift,sdulal/swift,stephentyrone/swift,danielmartin/swift,mightydeveloper/swift,kusl/swift,deyton/swift,ben-ng/swift,return/swift,frootloops/swift,allevato/swift,Jnosh/swift,bitjammer/swift,allevato/swift,shajrawi/swift,arvedviehweger/swift,kstaring/swift,airs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