Key TakeawaysYum! Brands shares fell after the fast-food restaurant operator reported earnings and revenue that came in short of analysts' expectations. U.S. revenue at KFC slumped 8% and was down 6% at Pizza Hut.Yum! Brands digital sales surpassed 50% for the first time ever. Yum! Brands (YUM) shares lost ground after the fast-food restaurant operator reported weaker-than expected earnings as sales fell at its KFC and Pizza Hut locations. The company reported first quarter adjusted earnings per share (EPS) ...