Tish Cyrus and her husband, Dominic Purcell, picked up some doughnuts to kick off the new week,putting on a united front while satisfying their sweet tooth amid rumors of a rift in her family, RadarOnline.com can reveal. On Monday, the couple stepped out to run errands in Burbank, CA, during which Dominic wrapped his arm around Tish, who was carrying a box of tasty pastries. Tish kept comfortable in a gray sweatshirt paired with straight-leg jeans and light brown boots while her counterpart opted for a blue striped track jacket and black sweatpants worn with Uggs in new photos published by the…