Fix for donut chart so that when a series only has one non-zero value, it still calculates the correct starting angle
Fix for donut chart so that when a series only has one non-zero value, it still calculates the correct starting angle

hansmaad/chartist-js,hansmaad/chartist-js,gionkunz/chartist-js,cr3ative/chartist-js,gionkunz/chartist-js,cr3ative/chartist-js,chartist-js/chartist,chartist-js/chartist,chartist-js/chartist