Clarify what `null` means
Clarify what `null` means

stephenc/jenkins,v1v/jenkins,ikedam/jenkins,Jochen-A-Fuerbacher/jenkins,DanielWeber/jenkins,oleg-nenashev/jenkins,godfath3r/jenkins,bkmeneguello/jenkins,viqueen/jenkins,damianszczepanik/jenkins,Jochen-A-Fuerbacher/jenkins,godfath3r/jenkins,Vlatombe/jenkins,bkmeneguello/jenkins,viqueen/jenkins,oleg-nenashev/jenkins,viqueen/jenkins,ikedam/jenkins,daniel-beck/jenkins,damianszczepanik/jenkins,batmat/jenkins,jenkinsci/jenkins,rsandell/jenkins,damianszczepanik/jenkins,DanielWeber/jenkins,v1v/jenkins,Vlatombe/jenkins,v1v/jenkins,ikedam/jenkins,daniel-beck/jenkins,Jochen-A-Fuerbacher/jenkins,Jochen-A-Fuerbacher/jenkins,MarkEWaite/jenkins,viqueen/jenkins,patbos/jenkins,daniel-beck/jenkins,batmat/jenkins,Vlatombe/jenkins,ikedam/jenkins,stephenc/jenkins,v1v/jenkins,oleg-nenashev/jenkins,recena/jenkins,rsandell/jenkins,damianszczepanik/jenkins,ikedam/jenkins,recena/jenkins,MarkEWaite/jenkins,stephenc/jenkins,ikedam/jenkins,recena/jenkins,godfath3r/jenkins,oleg-nenashev/jenkins,ikedam/jenkins,viqueen/jenkins,oleg-nenashev/jenkins,daniel-beck/jenkins,pjanouse/jenkins,pjanouse/jenkins,stephenc/jenkins,recena/jenkins,bkmeneguello/jenkins,batmat/jenkins,oleg-nenashev/jenkins,jenkinsci/jenkins,daniel-beck/jenkins,bkmeneguello/jenkins,bkmeneguello/jenkins,godfath3r/jenkins,patbos/jenkins,Jochen-A-Fuerbacher/jenkins,rsandell/jenkins,damianszczepanik/jenkins,jenkinsci/jenkins,recena/jenkins,ikedam/jenkins,jenkinsci/jenkins,daniel-beck/jenkins,damianszczepanik/jenkins,batmat/jenkins,stephenc/jenkins,recena/jenkins,v1v/jenkins,v1v/jenkins,Vlatombe/jenkins,DanielWeber/jenkins,batmat/jenkins,batmat/jenkins,patbos/jenkins,MarkEWaite/jenkins,DanielWeber/jenkins,MarkEWaite/jenkins,patbos/jenkins,pjanouse/jenkins,pjanouse/jenkins,rsandell/jenkins,pjanouse/jenkins,jenkinsci/jenkins,recena/jenkins,patbos/jenkins,DanielWeber/jenkins,daniel-beck/jenkins,bkmeneguello/jenkins,v1v/jenkins,stephenc/jenkins,Jochen-A-Fuerbacher/jenkins,MarkEWaite/jenkins,viqueen/jenkins,viqueen/jenkins,batmat/jenkins,MarkEWaite/jenkins,jenkinsci/jenkins,pjanouse/jenkins,damianszczepanik/jenkins,MarkEWaite/jenkins,rsandell/jenkins,rsandell/jenkins,rsandell/jenkins,patbos/jenkins,oleg-nenashev/jenkins,Vlatombe/jenkins,jenkinsci/jenkins,rsandell/jenkins,jenkinsci/jenkins,godfath3r/jenkins,godfath3r/jenkins,Vlatombe/jenkins,DanielWeber/jenkins,Jochen-A-Fuerbacher/jenkins,stephenc/jenkins,godfath3r/jenkins,DanielWeber/jenkins,bkmeneguello/jenkins,damianszczepanik/jenkins,daniel-beck/jenkins,Vlatombe/jenkins,patbos/jenkins,pjanouse/jenkins,MarkEWaite/jenkins