Skip custom value handeling without custom fields

Author: Joel-Luca

django_features/custom_fields/models/base.py

@@ -138,6 +138,8 @@ class Meta:
 
     def save(self, **kwargs: Any) -> None:
         super().save(**kwargs)
+        if not self.custom_values.exists():
+            return
         if self._custom_values_to_remove:
             self.custom_values.remove(*self._custom_values_to_remove)