April Pyne's abstraction showcase. (Credit: Malachi Lefurgey) The 10-year-old Gallery on Queen is one of those galleries that aren't afraid to represent the unrepresented, showcasing art that says and means something.   “That is my mandate,” said Nadia Khoury, owner of the gallery. On March 28, Khoury presented to the city of Fredericton “In Conversation,” a celebration of Black art.   “Black artists and history are not just February, we need to celebrate ... but the rest of