Following the departure of Yvette Nicole Brown, Donald Glover, Jonathan Banks and John Oliver, there were a few empty seats in Greendale classrooms needing to be filled. Thankfully, when Community airs its sixth season on Yahoo, a few new personalities will be added to the mix. Paget Brewster (Friends, Criminal Minds, American Dad) and Keith David (Enlisted, The Bible miniseries, 7th Heaven) have both signed on to star in the latest season of the sitcom. From Yahoo: Brewster will play Francesca “Frankie” Dart, a consultant brought in to help whip the school into shape (good luck with that), while David plays retired scientist Elroy Patashnik.” The 13 new episodes premier next year …