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GrowthBook Users

In Data Source settings, there's a "User Id Join Table (optional)" field. We don't link anon ids to user ids (as a policy). Sooo I left it blank, but it looks like that breaks any experiment that includes both anons and users.
Is that field meant to be optional? If so, under what conditions?

snippets of experiment query when it's left blank:
```WITH __identities as (
  -- ERROR: Missing User Id Join Table!
  SELECT
    '' as anonymous_id,
    '' as user_id
),
...
(then, in the __metric CTE):
    JOIN __identities i ON (i.user_id = m.user_id)```

That join table is used when an experiment is based on `anonymous_id` and you have a metric that only has a `user_id` column.