A Montana school district is carrying thousands of dollars in unpaid school lunch bills, but no student is ever turned away from a meal.According to The School Nutrition Association, the average unpaid school lunch debt is $6,900. Huntley Project Schools knows that reality well.See how the community helps: Shepherd woman donating funds from businesses to Huntley Project Schools"At any given point, we may have $7,000 of overdue lunch bills," Supe…