Adding users to a blog can set the primary_domain to an invalid value
|Reported by:||westi||Owned by:||westi|
In add_user_to_blog we update the primary_domain of a user to the $blog_id passed in if the user doesn't have a primary_domain yet.
When adding an existing user to an existing site in a multisite setup we pass a blank string to this function .
In a shared usertable setup where the users were all defined elsewhere (e.g. shared with bbPress) this cause use to create blank primary_domain entries in the database.
This then causes the code in get_active_blog_for_user() to add the user as a subscriber on the current blog - even if actually they already had a role!