No container Image Name cause panic

[Rencs]

Hello. In my situation, I set DOCKER_HOST as a swarm api service host(http://swarm_pi:4000), it just works well to listen to docker events. While, Some how, when I remove an existing docker image. The docker-gen just panic at here:
generator.go: 'registry, repository, tag := splitDockerImage(container.Config.Image)'
I think maybe this is a issue caused by Docker Remote Api calling, and skipping over there is OK。Please check the issue if it really matters.