Debate erupted Friday over whether some in the crowd outside St. Paul’s Cathedral in London Friday booed when Prince Harry and Meghan Markle arrived for the thanksgiving service in honor of the queen’s Platinum Jubilee. During the Sky TV broadcast, presenters said a mix of cheers and jeers accompanied the appearance of the Duke and Duchess of Sussex, who nonetheless kept their composure and continued to smile as they held hands and climbed the steps at St. Paul’s. It was the California-based couple’s first public appearance with other members of the royal family since the tension-filled Common…