Just weeks ago, Occidental Petroleum Corp. Chief Executive Vicki Hollub sought to reassure investors that her bold bet on U.S. shale oil—a $38 billion deal for rival Anadarko Petroleum Corp.—hadn’t left the company on shaky footing. An analyst asked on Feb. 28 if Occidental could weather the coronavirus outbreak and pay its beefy dividends as usual. “We’re actually in a good scenario, I think, because we don’t expect this situation to last,” she said. …