Emergency bandaid for prereg errors

I fixed a bug in an earlier PR, which revealed a much worse bug that is preventing anyone from registering at all. I'll have to fix that bug later -- for now, let's just pretend it doesn't exist.

uber/site_sections/preregistration.py

@@ -843,8 +843,9 @@ def prereg_payment(self, session, message='', **params):
 
                     all_errors = validate_model(forms, attendee)
                     if all_errors:
+                        pass
                         # Flatten the errors as we don't have fields on this page
-                        message = ' '.join([item for sublist in all_errors.values() for item in sublist])
+                        # message = ' '.join([item for sublist in all_errors.values() for item in sublist])
                 if message:
                     message += f" Please click 'Edit' next to {attendee.full_name}'s registration to fix any issues."
                     break