A popular Giant is heading out as the team deals with a roster crunch. The San Francisco Giants traded a fan favorite on Saturday as they deal with an increasingly crunched roster. A few hours before their morning game against the St. Louis Cardinals, the Giants announced that they had traded utility player Mauricio Dubón to the Houston Astros in exchange for catcher and first baseman Michael Papierski. Papierski, a 26-year old switch-hitter, will report to AAA Sacramento. The #SFGiants and the Houston Astros completed a trade today, with C/1B Michael Papierski joining the Giants organization in exchange for IF/OF…