[common] Cannot deploy services with type ExternalName

[danmanners]

Description

I am unable to deploy ExternalName resources. They do not use a ports field, but without it the helm rendering fails.

Expected Behavior

I should be able to deploy ExternalName service resources, which do not use ports.

Helm Values to replicate

service:
  main:
    enabled: true
    type: ClusterIP
    ports:
      http:
        protocol: TCP
        port: 80
        targetPort: 3001
  extname:
    enabled: true
    type: ExternalName
    externalName: kube.danmanners.com
    annotations:
      external-dns.alpha.kubernetes.io/hostname: hostname
      external-dns.alpha.kubernetes.io/ttl: "300"

library-charts/charts/stable/common/templates/classes/_service_ports.tpl

Line 12 in 1b8b81c

{{- if eq 0 (len $enabledPorts) }}

[bjw-s]

Thanks for raising the issue! We're currently reworking/rethinking this repo so it's in a bit of limbo temporarily, but we'll definitely try to get this fixed in the next version.