Three Tiananmen vigil activists convicted over refusing to comply with a national security data demand have been granted permission to take their appeal to the city’s top court. The Court of Final Appeal heard the leave application for leave to appeal from Chow Hang-tung, Tang Ngok-kwan and Tsui Hon-kwong, all former standing committee members of the Hong Kong Alliance in Support of Patriotic Democratic Movements of China, on Wednesday. The three activists were sentenced to four and a half months in prison last March after being found guilty of failing to comply with a notice issued by nationa…