PARIS (Reuters) - French billionaire Olivier Dassault was killed on Sunday in a helicopter crash, a police source said, with President Emmanuel Macron paying tribute to the 69-year old conservative politician. Dassault was the eldest son of late French billionaire industrialist Serge Dassault, whose namesake Dassault Aviation, builds the Rafale war planes and owns Le Figaro newspaper. “Olivier Dassault loved France. Captain of industry, lawmaker, local elected official, reserve commander in the air force: during his life, he never ceased to serve our country, to value its assets. His sudden death is a great loss. Thoughts on his family and...