An arrest for drinking beer in a gas station parking lot was unreasonable, a state appeals panel ruled this week.The 1st District Appellate Court held that such a lot isn’t part of a “public way” under the Municipal Code. Further, police shouldn’t get the benefit of the doubt because other provisions and their own guidelines state public ways don’t include privately owned property.“Simply put, drinking a can of beer on private property is not illegal in Chicago for individuals at least …