Forum taxonomy menu not populated when Default Container is set to only allowed container

Issue Summary

In certain cases, when I specify a default container it keeps the Forum menu from being populated.

Scenario:

1. Create a group & representing container, with one or more forums in the container. Put any other forums into that container as well.
2. Assign a user to the group.
3. Specify the container as the default.
4. Attempt to create a node as the user described above. Because of the og_forum_rewrite_sql(), the default container and its children do not appear in the Forum taxonomy menu, so the menu is empty.

Thoughts:

This is probably an unlikely scenario, but perhaps others will be confused by the documentation and end up in it. So it might be helpful to clarify the documentation.