A parolee with 7 previous arrests was busted for allegedly throwing a stranger onto the subway tracks in the Bronx last week, police said. Navar Douglas, 33, was picked up after his parole hearing Thursday and charged with attempted murder in connection to the April 28 evening attack on the 39-year-old victim at the 149th Street station, cops and sources said. Douglas, a stranger to the victim, exchanged words with him before picking him up and throwing him onto the No. 6 train roadbed around 8:30 p.m., authorities said. When the victim tried to get back up, the brute kicked him back onto the tracks, cops said. Navar Douglas, 33, was charged with attempted murder in connection to the April 28 evening attack on the 39-year-old victim at the 149th Street station, cops and sources said. DCPI The banged-up straphanger ultimately found his way back up and was hospitalized with only minor injuries, police said.…