For such Ingress resource...
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: ingress-no-host
spec:
rules:
- http:
paths:
- path: /testpath
backend:
serviceName: test
servicePort: 80
NGINX fails to reload because with nginx: [emerg] invalid number of arguments in \"server_name\" directive in /etc/nginx/conf.d/default-ingress-no-host.conf:12\n"