Rangers midfielder Connor Barron would’ve been celebrating after being called up to the Scotland squad for the UEFA Nations League clash with Portugal. Only a few days earlier was the talented 22-year-old midfielder a stand-out performer for the Scotland U21s as they succumbed to a 2-0 defeat to Belgium. It was enough to convince Steve Clarke that Connor Barron was the man to call upon when Celtic winger James Forrest pulled out of the squad. But the decision, initially lauded by Rangers fans, may well have backfired as the Scotland youth side suffer tournament heartbreak at the final hurdle. …