A trade publication, Inside Media, has reported that the nation’s largest vidstore chain, Blockbuster Video, is refusing to stock Orion Home Video’s “Shadows and Fog” because of publicity about the personal life of the film’s director, Woody Allen.A Blockbuster spokesman confirmed the chain was not carrying the title, but referred the question of why to a Blockbuster official who could not be reached for comment last night. The spokesman said, however, that Blockbuster would carry Columbia TriStar’s “Husbands and Wives,” also directed by Allen, when it is released on cassette, but offered no explanation. “Entertainment Tonight,” which picked up the story last night, reported Blockbuster said it passed on “Shadows and Fog” because it did not perform well at the box office. But Blockbuster routinely carries titles that have had little or no box office. An Orion spokesman said his company had no comment.