Katcy Stephan Cameron Mackintosh’s much-loved production of Boublil and Schönberg’s “Les Misérables” has descended upon L.A., giving Angelenos their chance to hear the people sing at the Hollywood Pantages Theatre. Purists won’t find any holes to poke in this air-tight national tour, which demonstrates a clear reverence for the beloved show’s storied history while delivering stunning, modern visuals and breathing new life into numbers like “A Heart Full of Love” with a healthy injection of humor.