The leader of an ethnic minority concern group has been arrested on suspicion of indecent assault and producing child pornography.Police received two reports against James Lung Wai-man, 44, on Wednesday and Friday, saying he had conducted unnecessary intimate behaviour with a child on separate occasions.Lung, who chairs the group Southern Democratic Alliance, which was founded in 2004 with a mission to unite South Asians with Hong Kong locals, was arrested in Tsuen Wan at about 8am on Friday…