The drone leader's previously high-flying stock likely won't stay down for long.Shares of AeroVironment (AVAV 12.94%) declined more than 12% on Wednesday after the unmanned aerial vehicle manufacturer's earnings fell short of investors' expectations. BlueHalo is boosting sales growth, but acquisition costs weighed on profitsAeroVironment's revenue soared 151% year over year to $472.5 million in its fiscal second quarter ended Nov. 1. The gains were fueled by the defense contractor's acquisition of BlueHalo, ...