plugin: if no use is_authenticated return an empty logout list

authentic2_idp_oauth2/__init__.py

@@ -16,8 +16,10 @@ class Plugin(object):
         return dashboard.get_admin_modules()
 
     def logout_list(self, request):
-        from . import models
+        if not request.user.is_authenticated():
+            return []
 
+        from . import models
         qs = models.A2Client.objects.filter(accesstoken__user=request.user,
                 accesstoken__expires__gt=now(), logout_url__isnull=False) \
                 .distinct()