A federal judge on Monday reversed the disorderly conduct conviction a man received for chaining his bicycle to a handicap-ramp railing at a veterans’ hospital.U.S. District Judge Sara L. Ellis found “no rational trier of fact” would have found defendant Pedro Donaldson guilty of violating a federal law that prohibits conduct that “unreasonably obstructs” entryways on U.S. Department of Veterans Affairs property.On Aug. 25, 2016, Donaldson locked his bike to the railing at the Jesse Brown VA …