An upcoming United Nations (UN) report featuring a blacklist of child rights violators is expected to refrain from toughening criticism of the Saudi-led coalition fighting in Yemen despite a bus bombing last year that killed scores of children, according to diplomats.UN Secretary-General Antonio Guterres is due to release the annual list of shame later this month ahead of a Security Council meeting on children and armed conflicts scheduled for 2 August.The coalition was put on the UN blacklis