Function hash_empty 

async fn hash_empty(
    userid_password: &Arc<Map>,
    user_id: &UserId,
) -> Result<Option<bool>>

Whether the account’s stored password is empty, or None when it has no row at all.

Both folds need the three states kept apart: a read failure is neither an active account nor a deactivated one, and mistaking it for either is how a pass that runs once leaves an account in the wrong state for good.