Fix panic when restarting non-existent service
Fix panic when restarting non-existent service

carolynhu/rancher-compose-executor,rancher/rancher-compose-executor,rancherio/rancher-compose,carolynhu/rancher-compose-executor,rancher/rancher-compose-executor,rancherio/rancher-compose,rancher/rancher-compose-executor,rancherio/rancher-compose,carolynhu/rancher-compose-executor