Fixed permission error with get_gradebook.
Fixed permission error with get_gradebook.

* This is unrelated to the internal error that was getting raised.

ucrcsedept/galah,brownhead/galah,galah-group/galah,brownhead/galah,galah-group/galah,galah-group/galah,brownhead/galah,ucrcsedept/galah,ucrcsedept/galah