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Solve the following python programming problem given the following code:
def load_site_config(full_reload = False) : 
    'Load stored site configuration settings.

    This populates the Django settings object with any keys that need to be
    there.
    ' 
    def apply_setting(settings_key, db_key, default = None) : 
        'Apply the given siteconfig value to the Django settings object.' 
        db_value = siteconfig.settings.get (db_key) 
        if db_value : 
            setattr (settings, settings_key, db_value) 
else : 
            if default : 
                setattr (settings, settings_key, default) 
def update_haystack_settings() : 
        'Update the haystack settings with settings in site config.' 
        apply_setting ('HAYSTACK_CONNECTIONS', None, { 
            'default' : { 
                'ENGINE' : settings.HAYSTACK_CONNECTIONS ['default'] ['ENGINE'], 
                'PATH' : (siteconfig.get ('search_index_file') or defaults ['search_index_file']), 
}, 
}) 
        connections.connections_info = settings.HAYSTACK_CONNECTIONS 
        connections._connections = { 
            
} 
dirty = False 
    try : 
        siteconfig = SiteConfiguration.objects.get_current () 
except SiteConfiguration.DoesNotExist : 
        raise ImproperlyConfigured ('The site configuration entry does not exist in the database. Re-run `./manage.py` syncdb to fix this.') 
except Exception as e : 
        logging.error (('Could not load siteconfig: %s' % e)) 
        return 
if (not siteconfig.get_defaults ()) : 
        siteconfig.add_defaults (defaults) 
mail_default_from = siteconfig.settings.get ('mail_default_from', global_settings.DEFAULT_FROM_EMAIL) 
    if ((not mail_default_from) or (mail_default_from == global_settings.DEFAULT_FROM_EMAIL)) : 
        domain = siteconfig.site.domain.split (':') [0] 
        siteconfig.set ('mail_default_from', ('noreply@' + domain)) 
site_static_root = siteconfig.settings.get ('site_static_root', '') 
    site_media_root = siteconfig.settings.get ('site_media_root') 
    if ((site_static_root == '') or (site_static_root ==...

    
    

    Fix the buggy line: if (backend and (backend is not custom_backends)) :
assistant
#Here is Python code to fix the buggy line: if (backend and (backend is not custom_backends)) :
.

if (backend and (backend is not builtin_backend_obj)) :