Elaine Low Senior TV WriterJason Schwartzman, Eric Roberts and Eric Andre are joining the cast of Danny McBride’s “The Righteous Gemstones,” the HBO comedy centered on a famous televangelist family with a penchant for greed.The nine-episode Season 2, which is currently in production, will see Schwartzman in the recurring role of Thaniel, a journalist working on a story on the ministries.