Jose Vidro, the Nats oft-injured second baseman, has been traded to the Seattle Mariners, pending a physical exam delayed until this morning. Vidro’s a three-time All Star with fine career numbers, and he’s a standup character. He’s shown admirable loyalty to the club throughout the franchise’s tumultuous past and gruesome near-term prognosis. After the clearing of roster debris like Ramon Ortiz, Tony Armas, and Joey Eishen, one might think that Nationals Nation would mourn –…