The coffee chain still has a lot of growth potential.Shares of coffee chain Dutch Bros (BROS -1.32%) sank nearly 20% following its second-quarter earnings report as guidance disappointed investors. The decline pushed the stock into negative territory for the year.Was the sell-off an overreaction? And should investors scoop up the stock on the dip?Raised guidance not enoughIn the second quarter, revenue climbed 30% year over year to $324.9 million, which topped the analyst consensus by over$7 million. Adjus ...