Chelsea’s Cole Palmer has been pretty faultless since he joined the club in the summer, but he had a very frustrating time in tonight’s cup tie against Middlesbrough. The Blues travelled to the Riverside Stadium on Tuesday evening to play Championship club Middlesbrough in the first leg of a Carabao Cup semi-final. Mauricio Pochettino’s side have left themselves with lots of work to do in the second leg after a surprise 1-0 away defeat. Hayden Hackney’s first-half goal earned Boro a win on the night and an advantage in the semi-final clash The teams will meet again on Tuesday 23 January for th…