do the ORG filtering as part of the mongo query. Also, don't trigger met...

...adata inheritence calculations when just trying to load 'about' information, which is not tied into the course tree anyhow (i.e. no parent/child relationship)
What about the other detached categories? I gave you the code for computing the list. This fix seems whack-a-mole otherwise. Also, the depth caveat only applies to 'course' not to detached categories.