Wrong user displayed in assignment dropdown when actual user is anonymised

[jonkri]

Describe the bug

We noticed that the wrong user was being displayed in the assignment dropdown in the inspector form.

Looking in the database, we figured out that the user_id value in user_planned_reports referenced a user that has been anonymized.

To Reproduce

Steps to reproduce the behavior:

1. Make sure there are at least two body users
2. Assign one of the users to a report
3. Remove the assigned user's account
4. Visit the report from Step 1
5. Notice that the wrong user is displayed in the assignment dropdown

Expected behavior

That the assignment dropdown displays “unassigned”.

Screenshots

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Desktop (please complete the following information):

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Smartphone (please complete the following information):

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Additional context

It seems to me that the dropdown should be able to handle anonymized users or that anonymized users should be unassigned.

The former option retains more information.