MARSEILLE, France -- It’s been a tough year for the performing arts in most countries, with virus lockdowns canceling shows and shuttering venues.But the world's top circus festival has found a way to flourish between the cracks in the rules — even without the huge crowds that would normally have attended.Ending Saturday in the Mediterranean port city of Marseille, the fourth edition of the Circus Biennale (BIAC), held every two years in the south of France, celebrates the injury-defying and