Warriors coach Steve Kerr now can add Oscar winner to his impressive awards collection after taking home the hardware Sunday as an executive producer for the documentary short “All the Empty Rooms.”While Kerr on Monday didn’t take much credit for the film, noting his title was “a fancy way of saying I had nothing to do with it,” he expressed how honored he was to be associated with the 35-minute look at how families have memorialized the bedrooms of children killed in mass shootings.“They asked me about a year ago if I wanted to be an executive producer, and I jumped at it when I read about the project because it’s such an important film,” Kerr told reporters at Capitol One Arena on Monday about the movie, which follows broadcast journalist Steve Hartman and photographer Lou Bopp as they interview the families. “Once I saw it, I was just blown away by the beauty, the sadness, the humanity, so poignantly done. And I think that it’s important, especially given my advocacy for gun violence prevention.“You look for ways to touch everybody and avoid the political discourse that brings the issue down, and I just thought...