(Reuters) - FTSE 100 lagged its European peers on Thursday as consumer giant Unilever said coronavirus lockdown measures took a toll on its quarterly sales.On a busy day for earnings and economic data, the blue-chip FTSE 100 index was flat at 0718 GMT, while the domestically focused FTSE 250 index gained 1%.Shares in Unilever Plc fell 5.6% as it pulled its full-year forecast, adding that a sharp decline in shopping and restaurant trips in China during first quarter offset gains from..