Allow nil to pass through running_nodes if not found
Allow nil to pass through running_nodes if not found

yangchengjian/rabbitmq,scalp42/rabbitmq,justanshulsharma/rabbitmq,nipe0324/rabbitmq,philipbalinov/rabbitmq,farshidce/rabbitmq,jujugrrr/rabbitmq,yangchengjian/rabbitmq,jdrago999/rabbitmq,brumschlag/rabbitmq,jdrago999/rabbitmq,XiangYao/rabbitmq,PerfectMemory/rabbitmq,jjasghar/rabbitmq,scalp42/rabbitmq,rogerhu/rabbitmq,justanshulsharma/rabbitmq,XiangYao/rabbitmq,jujugrrr/rabbitmq,jordant/rabbitmq,philipbalinov/rabbitmq,nipe0324/rabbitmq,jingzhaoou/rabbitmq,gocardless-cookbooks/rabbitmq,gocardless-cookbooks/rabbitmq,kri5/rabbitmq,farshidce/rabbitmq,kri5/rabbitmq,PerfectMemory/rabbitmq,rogerhu/rabbitmq,brumschlag/rabbitmq,jordant/rabbitmq,keepgo/rabbitmq,keepgo/rabbitmq,jjasghar/rabbitmq,jingzhaoou/rabbitmq