By Henry Burt Barcelona manager Xavi continues to be backed by the club’s president, Joan Laporta, despite the club’s subpar performance in this season’s Champions League. Wednesday’s 3-3 draw with Inter left Barça in serious danger of failing to qualify from their group for the second season in a row – the Nerazzurri need just one point against either Victoria Plzen or Bayern Munich – meaning they would drop into the Europa League. But despite criticism of Xavi for his side’s failure to perform in European competition, Barça chief Laporta has called on fans to have faith in the 42-year-old co…