Whenever he decides to hang his cleats up, Poland’s Robert Lewandowski will be remembered as one of the greatest goal-scorers in the history of soccer. But for as much success as he’s enjoyed on a domestic level with his various clubs, the legendary Polish No. 9 has yet to come through for his country on the biggest international stage. Lewandowski has not scored a goal for Poland in four career World Cup games. It’s admittedly a small sample size — not to mention the relatively poor quality of the rest of the Polish squad — but it is nonetheless an…