In the end, the outcome of Sunday’s summit of 16 oil ministers at Qatar’s Sheraton hotel turned on one country that wasn’t there. Iran’s decision, on the eve of the meeting, not to attend signaled things wouldn’t go well. When ministers assembled the next day, Saudi Arabia stunned some of them by insisting every OPEC member, including Iran, must subscribe to the deal to freeze oil production. Scheduled to end with an early afternoon press conference, proceedings dragged into the evening. When the meeting finally broke up without a deal just after 9 p.m. local time, it fell to the host minister, Qatar’s Mohammed Al Sada, to announce the result at a press conference for the dozens of reporters who’d flown in to cover the talks. “The inclusion of all OPEC members would definitely help in reaching an agreement,” he said, promising more consultation before the group’s June meeting. […]