The discount retailer turned in a disappointing earnings report.Shares of Dollar Tree (DLTR 7.72%) were getting hammered this week as the discount retailer posted disappointing results in its second-quarter earnings report. It followed in the footsteps of Dollar General, its larger rival, which also badly missed the mark in its earnings report, a sign that low-income consumers are cutting back on spending.As a result, Dollar Tree stock was trading down 19.8% for the week on the news as of 3:08 p.m. ET on Th ...