Description of problem:
Cannot create DataSource from default YAML.

Default YAML content:
apiVersion: cdi.kubevirt.io/v1beta1
kind: DataSource
metadata:
name: example
namespace: default
spec: {}

Error on UI:
Error "Required value" for field "spec.source".

Version-Release number of selected component (if applicable):
v4.12

How reproducible:

Steps to Reproduce:
1. Create DataSource from YAML
2.
3.

Actual results:
Error "Required value" for field "spec.source"

Expected results:
provide an usable example YAML for dataSource

Additional info: