Maybe Jon Hamm thought it might take a hearty meal to ease anxiety over the shocking Season 6 finale of “Mad Men.” The night before Sunday’s hotly awaited episode, Hamm and girlfriend Jennifer Westfeldt took in a large meal with friends at Circo on West 55th Street. The table of eight split a feast of pastas and appetizers. Hamm didn’t indulge in any Don Draper-style drinking, with sources telling us the table shared a mere bottle of red wine.