OTTAWA—A lawyer for Hassan Diab says a French appeal court’s order that the Ottawa sociology professor stand trial for a decades-old synagogue bombing is the latest misstep in a long odyssey of injustice. Donald Bayne told a news conference Wednesday the decision delivered in Paris “flies in the face of the existing evidence,” and he suggested French authorities are making Diab a scapegoat. “A demonstrably innocent man and his family have been enduring this nightmare for 10 years now,” Bayne said. “He’s going to be dragged through a future of uncertainty while for political reasons this case marches on in France.” Born in Lebanon, Diab became a Canadian citizen in 1993, working in Ottawa as a university teacher. The RCMP arrested him in November 2008 in response to a request by France. French authorities suspected Diab was involved in the 1980 bombing of a Paris synagogue that killed four people …