Set special vars to nil when the parameter is nil in Regexp#=~
Set special vars to nil when the parameter is nil in Regexp#=~

bbatsov/opal,gabrielrios/opal,gausie/opal,merongivian/opal,Ajedi32/opal,Mogztter/opal,fazibear/opal,castwide/opal,opal/opal,kachick/opal,opal/opal,catprintlabs/opal,catprintlabs/opal,bbatsov/opal,Ajedi32/opal,Mogztter/opal,gausie/opal,gausie/opal,opal/opal,kachick/opal,castwide/opal,kachick/opal,jannishuebl/opal,merongivian/opal,domgetter/opal,jgaskins/opal,suyesh/opal,castwide/opal,jgaskins/opal,iliabylich/opal,iliabylich/opal,gabrielrios/opal,merongivian/opal,fazibear/opal,Mogztter/opal,jgaskins/opal,Flikofbluelight747/opal,iliabylich/opal,catprintlabs/opal,c42engineering/opal,c42engineering/opal,bbatsov/opal,opal/opal,Mogztter/opal,kachick/opal,c42engineering/opal,gabrielrios/opal,Ajedi32/opal,wied03/opal,Flikofbluelight747/opal,suyesh/opal,jannishuebl/opal,wied03/opal,wied03/opal,suyesh/opal,jannishuebl/opal,fazibear/opal,Flikofbluelight747/opal,domgetter/opal