There was “sad news in the spirits world” when it was reported by Eater.com and countless other food and beverage blogs that Robert Cooper, the founder of the wildly popular St-Germain elderflower liqueur, died suddenly at the age of 39. Cooper was born into the booze business, but struck out on his own when his idea to make an elderflower liqueur (like those he’d encountered in London) was pooh-poohed by his father. The elder Cooper had cause to regret his …