Christopher Nolan “always wanted” to work with Robert Downey Jr. before casting him in ‘Oppenheimer’. The director has admitted he was a longtime admirer of the actor before handing him a role in the atomic bomb blockbuster – which earned him a Best Supporting Actor Oscar nominations – and Nolan says he wanted Downey Jr. in the cast because of his “incredible generosity of spirit”. During an appearance on ‘The Late Show With Stephen Colbert’, Nolan explained: “With anybody you work with, with actors … you’re looking for some kind of connection emotionally, empathetically. “You’re looking for s…