Trader Joe’s customers have sued the popular grocery chain claiming there is not enough caffeine in their coffee . The lawsuit filed in California Thursday alleges that Trader Joe’s deceived customers into believing its French Roast Low Acid whole bean coffee had significantly more caffeine than it did. "It is so common that it is now cliché that coffee drinkers depend on the caffeine contained therein to provide them with the energy they need to get through the day,” the lawsuit said, according to several media outlets. But when the coffee was tested, it was found to contain half the caffeine of a regular blend, according to the lawsuit. Trader Joe’s customers have sued the popular grocery chain, claiming there is not enough caffeine in their coffee (Getty Images) The French Roast Low Acid coffee has 51 percent of the caffeine of Trader Joe’s Dark French Roast coffee and 45 percent of the caffeine of Trader Joe’s House Blend coffee, NBC News reported, citing the lawsuit.…