You could see the reaction on the faces of the Celtic players as Alistair Johnston scored what was a pretty fortunate goal against Ross County on Saturday. Someone like Matt O’Riley just couldn’t hide his laughter as he watched his teammate net his second goal in Celtic colours, with the ball going over the line in slow motion after a deflection. You would have thought that the first-minute goal would open the floodgates for the home team at Parkhead and Derek Adams’ side would start to get punished. But it turned out to be the complete opposite, with Celtic ending up missing two penalties (in…