`availableUpdates: null` results in run-time error on Cluster Settings page

When a ClusterVersion's `status.availableUpdates` has a value of `null` and `Upgradeable=False`, a run time error occurs on the Cluster Settings page as the UpdatesGraph component expects `status.availableUpdates` to have a non-empty value.

1.  Add the following overrides to ClusterVersion config (/k8s/cluster/config.openshift.io~v1~ClusterVersion/version)

spec:
  overrides:
    - group: apps
      kind: Deployment
      name: console-operator
      namespace: openshift-console-operator
      unmanaged: true    
    - group: rbac.authorization.k8s.io
      kind: ClusterRole
      name: console-operator
      namespace: ''
      unmanaged: true
2.  Visit /settings/cluster and note the run-time error (see attached screenshot) 

An error occurs.

The contents of the Cluster Settings page render.