(Photo courtesy of The Lowell Sun) “River Hawk’s goalie Gustav Grigals blocks shot from UConn’s Justin Pearson.” Sarah Mahannah Connector Editor The UMass Lowell River Hawks (18-14-3) was the underdog in the Hockey East quarter-final game versus the fourth-seeded University of Connecticut Huskies (20-12-3). The River Hawks ended up winning the game and advancing to…