LONDON (Reuters) - Nagging coronavirus worries took a swipe at world markets on Friday but failed to stand in the way of the best week for stocks since June and the strongest for the dollar since August.European trading pushed stocks down and safe-haven government bonds up, a pattern set in Asia that traders seemed happy to extend before monthly U.S. jobs data.Investors wavered over the impact of the coronavirus. The rate of new infections has slowed, although the extent of the economic..