Switch away from the deprecated Field.error_message attribute.
Review Request #10205 — Created Oct. 8, 2018 and submitted — Latest diff uploaded
Django deprecated
Field.error_message
prior to Django 1.6, but we
still had a couple of cases where it was used. This change simply moves
us to the supportederror_messages
attribute, and cleans up some
surrounding code.
Manually tested that the errors were working.