(Reuters) - Big banks are postponing decisions about staff cuts as the coronavirus hits their businesses hard, with executives saying they are unsure how long the outbreak will hurt the economy and worried about being unprepared if business suddenly snaps back.Morgan Stanley , Goldman Sachs Group Inc , Deutsche Bank , HSBC Holdings PLC and Citigroup Inc were among those on Thursday reassuring staff privately or through public statements that job cuts are not on the table.Banks are hesitant to..