MEMPHIS, Tenn.—A former Tennessee state senator expelled from office after a conviction for using federal grant money on wedding expenses instead of the nursing school she operates was sentenced Friday to a year of probation but no prison time. Katrina Robinson had faced four to 10 months in prison under sentencing guidelines after she was found guilty in September of two counts of wire fraud in Memphis federal court. But U.S. District Judge Sheryl H. Lipman departed from the guidelines at sentencing, saying Robinson had already suffered greatly and the Memphis community would gain no benefit from prison time for the nursing school administrator, community leader, and mother of two. Robinson, a Democrat, was elected to represent a Memphis district in the state Senate in 2018. She was removed from office last month by the Republican-led Senate in a vote along party lines. The criminal case against Robinson involved federal …