Descriptive summary

In Hyrax 5.0.1 running Sirenia, when I attempt to update the visibility of a work, I receive a Failed save on # undefined method split' for nil:NilClass` message and the visibility does not update.

Steps to reproduce the behavior in User Interface (UI)

1. Run a local build of Sirenia using Docker
2. Log in and navigate to Dashboard -> Works
3. Click on the title of a work that you've already deposited (or deposit a new one if you don't have any works)
4. Click Edit
5. Select a different visibility setting (I went from Public to Institution) and click Save Changes
6. Observe message Failed save on # undefined method split' for nil:NilClass`
7. Go back to Dashboard -> Works and observe that visibility has not updated

Actual behavior (include screenshots if available)

Attempting to change the visibility of a work generates Failed save on # undefined method split' for nil:NilClass` message and does not update the visibility.

Acceptance Criteria/Expected Behavior

Attempting to change the visibility of a work should update the visibility accordingly

Rationale (for feature request only)

Provide the rationale or user story that describes "why" this issue should be addressed. Especially if this is a new feature or significant change to the existing implementation.

Related work

#6864