The city of Chicago must face a lawsuit alleging that a “code of silence” among members of the police force led an officer to believe he could sexually assault a minor without facing any consequences.In a written opinion this week, U.S. District Judge Sharon Johnson Coleman did not address the merits of the accusation that William Whitley exploited his status as an officer to deprive the minor — who filed her suit as a Jane Doe — of her liberty without due process of law.Coleman also did not address …