Per #923 filter() never returns a NotFound exception.

Author: n2ygk

oauth2_provider/models.py

@@ -401,12 +401,9 @@ def revoke(self):
         access_token_model = get_access_token_model()
         refresh_token_model = get_refresh_token_model()
         with transaction.atomic():
-            try:
-                token = refresh_token_model.objects.select_for_update().filter(
-                    pk=self.pk, revoked__isnull=True
-                )
-            except refresh_token_model.DoesNotExist:
-                return
+            token = refresh_token_model.objects.select_for_update().filter(
+                pk=self.pk, revoked__isnull=True
+            )
             if not token:
                 return
             self = list(token)[0]