OBITUARIES Nedra Volz, 94; TV Actress Played Many 'Old Lady' RolesBy Myrna Oliver, Times Staff WriterNedra Volz, a character actress remembered for her early 1980s roles as housekeeper Adelaide Brubaker on the popular television comedy "Diff'rent Strokes" and postmistress Miz Emma Tisdale on "The Dukes of Hazzard," has died. She was 94.Volz, who played her customary "old lady" role in her final film, "The Great White Hype," which was released in 1996, died Jan. 20 in Mesa, Ariz., of complications of Alzheimer's disease.[...]