A 12-year-old autistic boy missing in Tennessee was found safe Monday afternoon, WKRN reported. WKRN reported earlier that 12-year-old Sean Cummings was last seen at the Stoneridge Farms at the Hunt Club Apartment complex, off of Nashville Pike in Gallatin at around 11 p.m. Sunday night. His family reported him missing just before 8 a.m. …