[1.7.x] Fixed #8033 -- Explained app registry error during translation setup

import threading

import warnings

from django.core.exceptions import ImproperlyConfigured

from django.core.exceptions import AppRegistryNotReady, ImproperlyConfigured

from django.utils import lru_cache

from django.utils.deprecation import RemovedInDjango19Warning

from django.utils._os import upath

        Raises an exception if the registry isn't ready.

        """

        if not self.ready:

            raise RuntimeError("App registry isn't ready yet.")

            raise AppRegistryNotReady()

    def get_app_configs(self):

        """

    pass

class AppRegistryNotReady(Exception):

    """The django.apps registry is not populated yet"""

    pass

class ObjectDoesNotExist(Exception):

    """The requested object does not exist"""

    silent_variable_failure = True

import warnings

from django.apps import apps

from django.core.exceptions import AppRegistryNotReady

from django.dispatch import receiver

from django.test.signals import setting_changed

from django.utils.deprecation import RemovedInDjango19Warning

                    res.merge(t)

            return res

        for app_config in reversed(list(apps.get_app_configs())):

        try:

            app_configs = reversed(list(apps.get_app_configs()))

        except AppRegistryNotReady:

            raise AppRegistryNotReady(

                "The translation infrastructure cannot be initialized before the "

                "apps registry is ready. Check that you don't make non-lazy "

                "gettext calls at import time.")

        for app_config in app_configs:

            apppath = os.path.join(app_config.path, 'locale')

            if os.path.isdir(apppath):

                res = _merge(apppath)

Here are some common problems that you may encounter during initialization:

* ``RuntimeError: App registry isn't ready yet.`` This happens when importing

  an application configuration or a models module triggers code that depends

  on the app registry.

* ``AppRegistryNotReady`` This happens when importing an application

  configuration or a models module triggers code that depends on the app

  registry.

  For example, :func:`~django.utils.translation.ugettext()` uses the app

  registry to look up translation catalogs in applications. To translate at

    >>> import django

    >>> django.setup()

Otherwise, you will hit ``RuntimeError: App registry isn't ready yet.``

Otherwise, you will hit an ``AppRegistryNotReady`` exception.

App registry consistency

^^^^^^^^^^^^^^^^^^^^^^^^