AeroVironment wins an upgrade -- but does this unprofitable drone stock deserve it?Military drones manufacturer AeroVironment (AVAV +5.57%) stock gained 4% through 1:30 p.m. ET Friday.You can thank KeyBanc analyst Michael Leshock for that. This morning, Leshock initiated coverage on AeroVironment with an overweight rating and a $285 price target. Why KeyBank loves AeroVironment stockAlthough AeroVironment also makes some drones for civilian use, Leshock likes the company most for its "strong leverage to def ...