The stock's recent tumble reflected the company's disappointing results, but its potential recovery isn't being factored in at all.There's no denying that Dollar General's (DG -3.15%) second quarter was just plain bad. Not only did its top- and bottom-line results fall short of analysts' expectations, but its same-store sales growth was anemic, and profits fell year over year. The company dialed back its full-year estimastes as well. The stock was duly punished for all of it.There are, however, a handful of ...