The arrival of Nicolas Kuhn at Celtic was met with a bit of a lukewarm response by the fans. Only because we had never really heard of the winger before. The £3m buy from Rapid Vienna has struggled to make an impact in his first few outings in the green and white hoops. But on Sunday against Livingston, the 24-year-old showed some of the promise that persuaded Brendan Rodgers to shell out the seven-figure fee for him. And now, he is being tipped to kick on after his Sunday outing by John Hartson. The former Celtic hero was discussing Kuhn’s performance against David Martindale’s side and said …