Soccer fans around the world are familiar with the referee’s method of discipline — one yellow is a caution and red is an ejection — but do they know what a white card means? A match in Portugal on Saturday between Sporting Lisbon and Benfica saw the third card introduced for the first time — and it was done for good reason. A fan had fainted in the stands during the 44th minute of the Portuguese Women’s Cup quarterfinals, prompting medical staff from both teams to rush to provide aid, according to multiple reports. Once the situation had been resolved,…