Chris Willman Music WriterJust an hour prior to showtime, the trio Lady A announced it was pulling out of the CMA Awards telecast, become the third act to do so as a wave of COVID-19 exposure affects the country music community in Nashville.Unlike the two earlier artists who were forced to exit the show, Lee Brice and Florida Georgia Line’s Tyler Hubbard, Lady A said in its social media statement that none of the three members have received a positive coronavirus diagnosis, but said an unnamed