WILLMAR — The Willmar Fire Department was dispatched Friday morning to Willmar Middle School after a construction company reported the odor of natural gas. No one was injured and the gas was cleared after several hours of ventilating, according to a news release from Willmar Fire Chief Frank Hanson. The gas leak was reported at 8:22 a.m. Friday. Workers told Battalion Chief Jeff Gilbertson that they were preparing for some construction when they…