(Reuters) - European shares traded sideways on Friday as investors awaited fourth-quarter GDP data from across the euro zone, and another jump in coronavirus cases followed World Health Organization (WHO) assurances that the trajectory of the outbreak had not changed.Among big movers was British drugmaker AstraZeneca , which sank more than 5% and was on track for its worst day since mid-2017 after it fell short on quarterly earnings and warned the coronavirus was liable to hurt sales for..