def autodiscover():
    """
    Auto-discover INSTALLED_APPS admin.py modules and fail silently when
    not present. This forces an import on them to register any admin bits they
    may want.
    """
    
    import imp

    def module_has_submodule(mod, submod_name):
        try:
            imp.find_module(submod_name, mod.__path__)
            return True
        except ImportError:
            return False

    import copy
    from django.conf import settings
    from django.utils.importlib import import_module
    from django.contrib.admin.sites import site

    for app in settings.INSTALLED_APPS:
        mod = import_module(app)
        # Attempt to import the app's admin module.
        try:
            before_import_registry = copy.copy(site._registry)
            import_module('%s.admin' % app)
        except:
            # Reset the model registry to the state before the last import as
            # this import will have to reoccur on the next request and this
            # could raise NotRegistered and AlreadyRegistered exceptions
            # (see #8245).
            site._registry = before_import_registry

            # Decide whether to bubble up this error. If the app just
            # doesn't have an admin module, we can ignore the error
            # attempting to import it, otherwise we want it to bubble up.           
            if module_has_submodule(mod, 'admin'):
                raise