Former President Donald Trump’s niece assailed him and the media’s apparent acceptance of a new-and-improved rebrand at the Republican National Convention, which she called a “grotesque spectacle.” Mary Trump wrote Friday in her newsletter, “The Good In Us” that her uncle, the man accused of inciting a violent Jan. 6 attack on the U.S. Capitol, did so because he “couldn’t handle losing an election does not actually give a damn about unity.” “Donald Trump is no more capable of unifying this country than he was of being presidential. And yet, far too many people in the corporate media keep waiti…