Describe the bug

When creating a new room in the room booking module of a fresh and completely empty Indico instance, I can't create a room as I am unable to assign a user as the room owner. The user search fails with

Access Denied
No search token. This is a bug, please report it.

To Reproduce

Steps to reproduce the behavior:

1. Create a fresh and completely empty Indico instance (v3.3.7) with the room booking module enabled
2. Login as a site admin user, go to the room booking module
3. Create a new location, then try to create a new room for this location
4. User search fails, which prohibits filling out the form

Expected behavior

User search should not fail for instance admins.

Additional context

I have found the (quite likely) responsible code and the comment explaining this behavior at

I believe the logic should be slightly amended such that a token is created for site admins regardless of whether there are rooms or not. Alternatively, if this is the intended behavior, explicit documentation for creating a first room should be added.