Even today it seems shocking that, in 1942, Lubitsch satirized occupied Warsaw with a spirited cast including Jack Benny and Carole Lombard, foiling Nazis who crack jokes about concentration camps and careening through harrowing complications like an air raid, a fatal shooting and buffoonery with a corpse. It’s all served up with that celebrated “Lubitsch touch,” which employed elegance and wit to create civilized entertainments even in the darkest of settings.