Mazi Smith did not travel with the Cowboys to Las Vegas ahead of Saturday’s preseason game against the Raiders, the franchise announced. He suffered an allergic reaction Friday afternoon at training camp. The Cowboys confirmed Smith received treatment and will receive further evaluation on Saturday ahead of the 9 p.m. CT kickoff at Allegiant Stadium. As for what his status will be, that update will come later in the day, the team said. “DT Mazi Smith experienced an allergic reaction this afternoon at training camp that resulted in him not being able to travel with the team to Las Vegas,” the C…