Fixed #23946 -- Fixed runserver crash when socket error contains Unicode chars.

from django.db import connections, DEFAULT_DB_ALIAS

from django.db.migrations.executor import MigrationExecutor

from django.utils import autoreload

from django.utils.encoding import get_system_encoding

from django.utils.encoding import get_system_encoding, smart_text

from django.utils import six

from django.core.exceptions import ImproperlyConfigured

            try:

                error_text = ERRORS[e.errno]

            except KeyError:

                error_text = str(e)

                error_text = smart_text(e)

            self.stderr.write("Error: %s" % error_text)

            # Need to use an OS exit because sys.exit doesn't work in a thread

            os._exit(1)

* Fixed a regression in ``contrib.admin`` add/change views which caused some

  ``ModelAdmin`` methods to receive the incorrect ``obj`` value

  (:ticket:`23934`).

* Fixed ``runserver`` crash when socket error message contained Unicode

  characters (:ticket:`23946`).