Olly Murs has revealed he was rushed to hospital for an emergency operation on his knee after doctors said he had hours to save his leg.The 36 year old, who recently said Caroline Flack's death "left a massive hole in his life", said that his surgeon suspected he might have had life-threatening blood poisoning after the metal plate that had been inserted got infected three months after his original operation.The Voice judge explained that his surgeon called him to say: "You need to come into