MUNICH (Reuters) - German sportswear company Puma announced on Tuesday that 1,400 staff would switch to shorter work hours until April 13 as sales slump due to the coronavirus and said its three top executives would not take their pay for April.Germany allows companies to apply for state aid to keep people working but switch to shorter hours.A Puma spokeswoman said almost all the shops that Puma and its partners operate had been closed due to the coronavirus.Employees at the company's..