The Art of the Con Don Jr. testified for the defense in the NY fraud trial on Monday and spent his time talking about his father’s brilliance and his company’s success: n a return appearance at a trial that has featured a parade of Trumps on the stand as they fight for the future of their family business, the junior Mr. Trump testified in bursts of hyperbole and platitudes. His rhetoric sounded as though it had been ripped from the pages of an airline magazine or a travel brochure, and he saved the highest praise for the man who he said made it all happen: his father, a “visionary” who is “an artist with real estate” and “creates things that other people would never envision.” Yet some of his high-flying claims clashed with present-day reality. In recent years, the Trump Organization has shrunk, as the family name was scrubbed from some of the properties he extolled, taken off buildings in New York, Washington and, soon, Hawaii. Trump Tower and 40 Wall Street have also, at times, lost a number of tenants. Some of the former president’s properties struggled even to turn a profit. In fact his father is just a rich kid who had a knack for self-promotion and was a dud at business. It’s just that he inherited a lot from his father and happened on a lucrative TV deal that perfectly fit his only real talent. He’s proving that he’s nothing more than a hype artist even as…