Four days after five professional hockey players, including Flyers goalie Carter Hart, were charged with sexual assault, NHL commissioner Gary Bettman sat at a dais on All-Star weekend and claimed his league has a domestic violence/sexual assault policy in place. Here’s the problem: The policy is nowhere to be found. It exists in Bettman’s head. A small section of the league’s collective bargaining agreement — Section 18-A — allows him the power to discipline any player who is “guilty of conduct that is detrimental to or against the welfare of the League or the game of hockey.” That is the cor…