Oil prices moved back into black territory after signs of modest growth in the European economy and fewer U.S. jobless claims. File photo by John Angelillo/UPI Dec. 7 (UPI) — A rebound in GDP in the European Union and a possible cash-squeeze for U.S. shale operators pushed oil prices into positive territory Thursday. Last week, the Organization of Economic Cooperation and Development reported growth in the world’s industrialized economies was apparent, but also lopsided. Nevertheless, the economies in Europe continued to show slow, but steady, momentum for the year. The European Commission’s record-keeping office reported gross domestic production for the third quarter was up 0.6 percent for the 28 member states and those countries using the euro currency to 2.6 percent. Last week, the U.S. Commerce Department reported GDP increased at an annual rate of 3.3 percent during the third quarter, an improvement over second quarter growth of 3.1 […]