BEIJING (Reuters) – Chinese former Vice Premier Zhang Gaoli made his first public appearance on Sunday since Chinese tennis star Peng Shuai accused him of sexual assault last year, attending the 20th Communist Party Congress. Zhang, 75, walked onstage at the Great Hall of the People in Beijing behind President Xi Jinping and other retired and current leaders, and sat in the front row of the podium for the opening of the twice-a-decade meeting. He has made no public comment on the accusation. Peng made her accusation on social media in November in a post that was soon scrubbed from China’s inte…