LOS ANGELES (Reuters) - Director Michael Moore championed non-fiction filmmakers on Wednesday night at a pre-Oscar event honoring nominees for best documentaries, attributing a growing appetite for the art form to a public starved for the truth. The often controversial director, who won an Oscar for gun control movie "Bowling for Columbine" and scored the highest-grossing documentary of all-time with anti-war film "Fahrenheit 9/11," was hosting a symposium at the Academy of Motion Picture Arts and Sciences featuring nominees for best documentary features and short subjects. ...