So continues the tragic saga that is Atlantic City's casino industry. In a somewhat surprising but probably foreseeable development yesterday, a deal to buy up a bankrupt Revel -- the city's newest and most expensive and, by many accounts, biggest flop of a casino -- fell through when Florida investor Glenn Straub walked away from the bargaining table. It's the second time a deal to sell off the $2.4 billion behemoth has come undone -- and the latest chapter in the story of Atlantic City's down-spiraling gambling market, shrunk by nearly half over the last eight years.