Don't crash if inserting a nil node
Don't crash if inserting a nil node

facebook/AsyncDisplayKit,jellenbogen/AsyncDisplayKit,jellenbogen/AsyncDisplayKit,tomizimobile/AsyncDisplayKit,flovouin/AsyncDisplayKit,romyilano/AsyncDisplayKit,jellenbogen/AsyncDisplayKit,lappp9/AsyncDisplayKit,samhsiung/AsyncDisplayKit,lappp9/AsyncDisplayKit,Adlai-Holler/AsyncDisplayKit,flovouin/AsyncDisplayKit,smyrgl/AsyncDisplayKit,jellenbogen/AsyncDisplayKit,rahul-malik/AsyncDisplayKit,romyilano/AsyncDisplayKit,gazreese/AsyncDisplayKit,rmls/AsyncDisplayKit,chrisdanford/AsyncDisplayKit,lappp9/AsyncDisplayKit,samhsiung/AsyncDisplayKit,harryworld/AsyncDisplayKit,JetZou/AsyncDisplayKit,george-gw/AsyncDisplayKit,garrettmoon/AsyncDisplayKit,Adlai-Holler/AsyncDisplayKit,samhsiung/AsyncDisplayKit,aaronschubert0/AsyncDisplayKit,garrettmoon/AsyncDisplayKit,facebook/AsyncDisplayKit,aaronschubert0/AsyncDisplayKit,Adlai-Holler/AsyncDisplayKit,smyrgl/AsyncDisplayKit,harryworld/AsyncDisplayKit,aaronschubert0/AsyncDisplayKit,JetZou/AsyncDisplayKit,rahul-malik/AsyncDisplayKit,bimawa/AsyncDisplayKit,garrettmoon/AsyncDisplayKit,levi/AsyncDisplayKit,garrettmoon/AsyncDisplayKit,flovouin/AsyncDisplayKit,garrettmoon/AsyncDisplayKit,maicki/AsyncDisplayKit,romyilano/AsyncDisplayKit,facebook/AsyncDisplayKit,romyilano/AsyncDisplayKit,maicki/AsyncDisplayKit,george-gw/AsyncDisplayKit,Adlai-Holler/AsyncDisplayKit,harryworld/AsyncDisplayKit,tomizimobile/AsyncDisplayKit,gazreese/AsyncDisplayKit,bimawa/AsyncDisplayKit,lappp9/AsyncDisplayKit,rmls/AsyncDisplayKit,tomizimobile/AsyncDisplayKit,smyrgl/AsyncDisplayKit,maicki/AsyncDisplayKit,chrisdanford/AsyncDisplayKit,harryworld/AsyncDisplayKit,tomizimobile/AsyncDisplayKit,levi/AsyncDisplayKit,samhsiung/AsyncDisplayKit,george-gw/AsyncDisplayKit,harryworld/AsyncDisplayKit,facebook/AsyncDisplayKit,flovouin/AsyncDisplayKit,rmls/AsyncDisplayKit,levi/AsyncDisplayKit,Adlai-Holler/AsyncDisplayKit,rmls/AsyncDisplayKit,smyrgl/AsyncDisplayKit,maicki/AsyncDisplayKit,JetZou/AsyncDisplayKit,gazreese/AsyncDisplayKit,chrisdanford/AsyncDisplayKit,aaronschubert0/AsyncDisplayKit,aaronschubert0/AsyncDisplayKit,rahul-malik/AsyncDisplayKit,tomizimobile/AsyncDisplayKit,bimawa/AsyncDisplayKit,maicki/AsyncDisplayKit,rahul-malik/AsyncDisplayKit,JetZou/AsyncDisplayKit,bimawa/AsyncDisplayKit,jellenbogen/AsyncDisplayKit,george-gw/AsyncDisplayKit,rmls/AsyncDisplayKit,JetZou/AsyncDisplayKit,flovouin/AsyncDisplayKit,levi/AsyncDisplayKit,levi/AsyncDisplayKit,chrisdanford/AsyncDisplayKit,gazreese/AsyncDisplayKit