Description of problem:

ClusterPermission creates empty subject field

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

How reproducible:

Steps to Reproduce:

1. Create a MulticlusterRoleAssignment CR
2. Notice the corresponding ClusterPermission CR created will contain an empty subject field

Actual results:

An empty subject field is created:

Expected results:

No empty subject field.

Additional info:

This is caused by the subject and subjects field missing the omitempty annotation