Fix `minikube service` to show error message if service has no node ports
Fix `minikube service` to show error message if service has no node ports

kubernetes/minikube,dlorenc/minikube,dlorenc/minikube,dlorenc/minikube,kubernetes/minikube,kubernetes/minikube,dlorenc/minikube,warmchang/minikube,warmchang/minikube,dlorenc/minikube,dalehamel/minikube,kubernetes/minikube,dlorenc/minikube,kubernetes/minikube,dalehamel/minikube,dalehamel/minikube,kubernetes/minikube,warmchang/minikube,dlorenc/minikube,warmchang/minikube,warmchang/minikube,kubernetes/minikube,warmchang/minikube,warmchang/minikube,dlorenc/minikube