web2py/web2py — pull request #445 by dokime7 (2014-05-16 14:14:40+00:00)
Title: Fix IS_STRONG used with validate_and_update

Fix no error return with IS_STRONG validator because it returns a gluon.html.XML instead of str, so when pushed to response.errors that is a Row, it isn't display because Row object filters his output and doesn't support XML objects.