New Delhi, April 16 -- This year saw actor Nawazuddin Siddiqui in intense but critically acclaimed films such as Thackeray and Photograph, so far. The actor will be next seen in a light-hearted film. Even though he has done a variety of films, from offbeat to commercial entertainers, the actor believes irrespective of the space, "the story should have some substance given any genre or milieu"....