Fixed #15603 -- Changed the traceback error e-mails not to use HTML by...

    logger.addHandler(NullHandler())

class AdminEmailHandler(logging.Handler):

    """An exception log handler that emails log entries to site admins

    def __init__(self, include_html=False):

        logging.Handler.__init__(self)        

        self.include_html = include_html

    """An exception log handler that e-mails log entries to site admins.

    If the request is passed as the first argument to the log record,

    request data will be provided in the

        message = "%s\n\n%s" % (stack_trace, request_repr)

        reporter = ExceptionReporter(request, is_email=True, *exc_info)

        html_message = reporter.get_traceback_html()

        html_message = self.include_html and reporter.get_traceback_html() or None

        mail.mail_admins(subject, message, fail_silently=True,

                         html_message=html_message)

Django provides one log handler in addition to those provided by the

Python logging module.

.. class:: AdminEmailHandler()

.. class:: AdminEmailHandler([include_html=False])

    This handler sends an e-mail to the site admins for each log

    message it receives.

    If the log record contains a 'request' attribute, the full details

    If the log record contains a ``request`` attribute, the full details

    of the request will be included in the e-mail.

    If the log record contains stack trace information, that stack

    trace will be included in the e-mail.

    The ``include_html`` argument of ``AdminEmailHandler`` is used to

    control whether the traceback e-mail includes an HTML attachment

    containing the full content of the debug Web page that would have been

    produced if ``DEBUG`` were ``True``. To set this value in your

    configuration, include it in the handler definition for

    ``django.utils.log.AdminEmailHandler``, like this::

        'handlers': {

            'mail_admins': {

                'level': 'ERROR',

                'class': 'django.utils.log.AdminEmailHandler',

                'include_html': True,

            }

        },

    Note that this HTML version of the e-mail contains a full traceback,

    with names and values of local variables at each level of the stack, plus

    the values of your Django settings. This information is potentially very

    sensitive, and you may not want to send it over e-mail. Consider using

    something such as `django-sentry`_ to get the best of both worlds -- the

    rich information of full tracebacks plus the security of *not* sending the

    information over e-mail.

.. _django-sentry: http://pypi.python.org/pypi/django-sentry