spec.hostsConfRef: Invalid value: \"null\"

[PangQingcheng]

Describe the version
version about:

1. kubean

Describe the bug
In the current version of kubean-controller, if hostsConfRef is not specified when deploying ClusterOperation, it will result in errors similar to:

E1215 06:35:15.979448       1 controller.go:250] "failed to update ownreference" err="ClusterOperation.kubean.io \"cluster-mini-ping-ops\" is invalid: spec.hostsConfRef: Invalid value: \"null\": spec.hostsConfRef in body must be of type object: \"null\"" cluster="cluster-mini" clusterOps="cluster-mini-ping-ops"

How To Reproduce

apiVersion: kubean.io/v1alpha1
kind: ClusterOperation
metadata:
  name: cluster-mini-ping-ops
spec:
  cluster: cluster-mini
  image: xxxx/spray-job:v0.30.2
  actionType: playbook
  action: ping.yml
  preHook: []
  postHook: []

Expected behavior

Screenshots and log

Additional context
Repair suggestions:
Add the omitempty json tag to HostsConfRef, PreHook, and PostHook in ClusterOperation.spec

[ErikJiang]

Please provide more information, such as Cluster and related configmap resources, etc. yaml

[github-actions]

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