The parents of Riley Strain tearfully accepted their late son’s diploma at the University of Missouri over the weekend. During the College of Arts & Sciences graduation, the university presented the 22-year-old’s grieving family with his degree, according to WIBW-TV. His parents and step-parents received his diploma during the emotional commencement ceremony and were met with a standing ovation. Strain, who vanished from Luke’s 32 Bridge downtown Nashville bar after he was kicked out March 8, was set to graduate Saturday. His body was discovered in the Cumberland River, two weeks after he disa…