Data: Bureau of Labor Statistics; Note: Core white-collar is the sum of employment in financial activities, information, and professional and business services sectors; Chart: Neil Irwin/Axios The market for many types of white-collar professional workers is bad. The overall U.S. job market is pretty healthy. There is less of a contradiction here than it might seem. The big picture: These are gloomy times for many office workers — their employers shedding payroll, their livelihoods threatened by