He is, of course, the original H. Potter, a silver-screen legend long before young Harry was even a twinkle in a witch’s eye. You know him better, perhaps, as “Mister Potter,” stern-browed, stentorian, scowling and shrewd, the true star of that annual tryst for our tear ducts, Frank Capra’s It’s A Wonderful Life. Forget, for a while, ingratiating George Bailey, batty Uncle Billy, and Zuzu’s precious petals. This Christmas, why not focus instead on Mr. Capra’s greatest creation, Henry Potter (no one called him Harry), the J. P. Morgan of Bedford Falls, a Main Street mogul with an empire to [...]