Cologne coach Steffen Baumgart hopes for a trouble-free final Europa Conference League group match on Thursday against French side Nice which they must win to reach the knock-outs. The reverse fixture in France was overshadowed by violence from both camps which forced a one-hour delay. Cologne police earlier in the week appealed to fans to stay peaceful or face the full force of the law but potentially violent fans are expected at the match. Baumgart told reporters on Wednesday that he hopes “everyone is aware this time around that is about football. “Football can’t constantly be a stage where…