[JENKINS-50748] Handle null arg to jsStringEscape
[JENKINS-50748] Handle null arg to jsStringEscape

(cherry picked from commit 7c23884c5979c9bebb4bbb7bfa64726bd05c163b)

amuniz/jenkins,sathiya-mit/jenkins,kohsuke/hudson,amuniz/jenkins,ErikVerheul/jenkins,oleg-nenashev/jenkins,rsandell/jenkins,kohsuke/hudson,Jochen-A-Fuerbacher/jenkins,recena/jenkins,damianszczepanik/jenkins,ikedam/jenkins,Vlatombe/jenkins,Vlatombe/jenkins,daniel-beck/jenkins,sathiya-mit/jenkins,DanielWeber/jenkins,batmat/jenkins,andresrc/jenkins,DanielWeber/jenkins,daniel-beck/jenkins,rsandell/jenkins,sathiya-mit/jenkins,amuniz/jenkins,godfath3r/jenkins,bkmeneguello/jenkins,recena/jenkins,batmat/jenkins,daniel-beck/jenkins,kohsuke/hudson,amuniz/jenkins,ikedam/jenkins,viqueen/jenkins,pjanouse/jenkins,v1v/jenkins,rsandell/jenkins,Jochen-A-Fuerbacher/jenkins,aldaris/jenkins,ErikVerheul/jenkins,oleg-nenashev/jenkins,bkmeneguello/jenkins,damianszczepanik/jenkins,ErikVerheul/jenkins,amuniz/jenkins,jenkinsci/jenkins,pjanouse/jenkins,jenkinsci/jenkins,daniel-beck/jenkins,daniel-beck/jenkins,pjanouse/jenkins,bkmeneguello/jenkins,damianszczepanik/jenkins,andresrc/jenkins,sathiya-mit/jenkins,rsandell/jenkins,jenkinsci/jenkins,DanielWeber/jenkins,damianszczepanik/jenkins,v1v/jenkins,ErikVerheul/jenkins,aldaris/jenkins,ikedam/jenkins,stephenc/jenkins,stephenc/jenkins,godfath3r/jenkins,Vlatombe/jenkins,MarkEWaite/jenkins,daniel-beck/jenkins,amuniz/jenkins,ErikVerheul/jenkins,stephenc/jenkins,v1v/jenkins,viqueen/jenkins,sathiya-mit/jenkins,jenkinsci/jenkins,batmat/jenkins,rsandell/jenkins,DanielWeber/jenkins,patbos/jenkins,andresrc/jenkins,ikedam/jenkins,godfath3r/jenkins,godfath3r/jenkins,godfath3r/jenkins,ErikVerheul/jenkins,rsandell/jenkins,patbos/jenkins,viqueen/jenkins,DanielWeber/jenkins,jenkinsci/jenkins,patbos/jenkins,aldaris/jenkins,Jochen-A-Fuerbacher/jenkins,v1v/jenkins,pjanouse/jenkins,aldaris/jenkins,kohsuke/hudson,batmat/jenkins,Vlatombe/jenkins,oleg-nenashev/jenkins,MarkEWaite/jenkins,recena/jenkins,patbos/jenkins,bkmeneguello/jenkins,kohsuke/hudson,kohsuke/hudson,ikedam/jenkins,jenkinsci/jenkins,daniel-beck/jenkins,godfath3r/jenkins,DanielWeber/jenkins,Vlatombe/jenkins,recena/jenkins,viqueen/jenkins,pjanouse/jenkins,Jochen-A-Fuerbacher/jenkins,aldaris/jenkins,MarkEWaite/jenkins,recena/jenkins,daniel-beck/jenkins,MarkEWaite/jenkins,godfath3r/jenkins,aldaris/jenkins,MarkEWaite/jenkins,andresrc/jenkins,batmat/jenkins,DanielWeber/jenkins,damianszczepanik/jenkins,oleg-nenashev/jenkins,stephenc/jenkins,andresrc/jenkins,jenkinsci/jenkins,andresrc/jenkins,oleg-nenashev/jenkins,batmat/jenkins,recena/jenkins,kohsuke/hudson,ikedam/jenkins,recena/jenkins,viqueen/jenkins,Jochen-A-Fuerbacher/jenkins,bkmeneguello/jenkins,pjanouse/jenkins,oleg-nenashev/jenkins,v1v/jenkins,stephenc/jenkins,andresrc/jenkins,ikedam/jenkins,MarkEWaite/jenkins,kohsuke/hudson,ErikVerheul/jenkins,ikedam/jenkins,v1v/jenkins,viqueen/jenkins,patbos/jenkins,MarkEWaite/jenkins,jenkinsci/jenkins,stephenc/jenkins,damianszczepanik/jenkins,batmat/jenkins,Jochen-A-Fuerbacher/jenkins,rsandell/jenkins,Vlatombe/jenkins,damianszczepanik/jenkins,sathiya-mit/jenkins,viqueen/jenkins,sathiya-mit/jenkins,bkmeneguello/jenkins,v1v/jenkins,pjanouse/jenkins,oleg-nenashev/jenkins,rsandell/jenkins,amuniz/jenkins,bkmeneguello/jenkins,patbos/jenkins,damianszczepanik/jenkins,Vlatombe/jenkins,MarkEWaite/jenkins,stephenc/jenkins,Jochen-A-Fuerbacher/jenkins,aldaris/jenkins,patbos/jenkins