Get the stories that matter to you sent straight to your inbox with our daily newsletter.A blade thug who tried to rob a teenager while high on drugs has been jailed for more than two years.Dean Kerr was under the influence of Valium when he approached the youngster and his pal while armed with a flick knife.The pals had spotted Kerr, 26, shouting and bawling in the street in Paisley on June 26.Procurator Fiscal Depute David McDonald told Paisley Sheriff Court: “At 6.30pm, two teenage witnesses