500 while edit a user with a not-allowed visibility

[zokkis]

Description

Similar to #29218

If there is a user which is created with 'public' and then change ALLOWED_USER_VISIBILITY_MODES to only allow 'limited'
When you now try to edit the user without touching visibility, then you get an 500 error

I think this needs to be discussed, because the solution can be

• force change the visibility while edit
• dont change visibility and somehow prevent this error

Gitea Version

1.21.5

Can you reproduce the bug on the Gitea demo site?

No

Log Gist

No response

Screenshots

No response

Git Version

No response

Operating System

Linux

How are you running Gitea?

build from binary, amd64

Database

SQLite