Clayton Davis Ahead of tonight’s Producers Guild of America awards ceremony, the annual breakfast with the nominees for the Darryl F. Zanuck Award at the Skirball Cultural Center.The theme of the panel, moderated by PGA president Lisa Fisher, was Steven Spielberg, nominated as one of the producers for his musical “West Side Story.”During the conversation, the two-time Oscar-winning director — for “Schindler’s List” (1993) and “Saving Private Ryan” (1998) — shared with the audience that he’ll never direct another musical in his career, although he’ll be involved as a producer on some. He’s currently co-producing the musical adaptation of “The Color Purple” with Fantasia Barrino and Danielle Brooks in the lead roles.