MIAMI — As Venezuela’s economy was crashing in 2017, the country’s state-owned oil company hired former U.S. Rep. David Rivera for a costly public relations campaign to improve the tarnished image of the Venezuelan firm in the United States. In just a few months, Rivera’s consulting business collected $20 million from Venezuela’s U.S. subsidiary, PDV USA, but its contract with the former Florida Republican abruptly ended when he was accused of doing little work, according to a lawsuit. Newly filed court documents reveal that Rivera diverted more than half of his PDV USA income — $13 million — …