Medical Properties Trust hopes getting rid of one of its biggest headaches will help its stock turn things around.For years, Medical Properties Trust (MPW 2.08%) dealt with a great deal of uncertainty concerning one of its operators, Steward Health. The operator's financial difficulties even led to the real estate investment trust (REIT) cutting its dividend payment multiple times as rent collection issues weighed on its results. When Steward Health filed for Chapter 11 bankruptcy protection earlier this ye ...