Changes to GET /payers/csv

the code response property's minLength was decreased from 1 to 0 for the response status 404

the code response property's minLength was decreased from 1 to 0 for the response status 500

the message response property's minLength was decreased from 1 to 0 for the response status 404

the message response property's minLength was decreased from 1 to 0 for the response status 500