kctrl: Helm array values with an empty default should still get an items field in their OpenAPI schema

[gcapizzi]

What steps did you take:

kctrl package release --openapi-schema of a package using a helmTemplate.

What happened:

Helm array values with an empty default, e.g.

# -- Add custom arguments to the Crossplane pod.
args: []

don't get an items field in OpenAPI:

args:
  default: []
  description: Add custom arguments to the Crossplane pod.
  type: array

What did you expect:

An items field, as it's required in OpenAPI:

args:
  default: []
  description: Add custom arguments to the Crossplane pod.
  type: array
  items: {}

Anything else you would like to add:

Using {} to provide an empty schema for items is valid and acceptable, as in this case we don't have any information about the type of the array items. This results in the array accepting arbitrary types.

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