The so-called war on sugar has a new battleground: Halloween. Some Americans are so spooked about the harmful effects of sugar they are finding healthier ways to indulge during the holiday, without disappointing children by handing out apples. Sugary chocolates still dominate Halloween candy handed out and provide an annual sales treat for companies like Hershey Co, privately held Mars and Nestle SA. But as more consumers demand healthier candies, manufacturers could see the so-called…