fix(dev): check url_changed in domain implementation;

- Check `url_changed`.

ckanext/xloader/plugin.py

@@ -77,7 +77,9 @@ def notify(self, entity, operation):
         We want to check if values have changed, namely the url.
         See: ckan/model/modification.py.DomainObjectModificationExtension
         """
-        if operation != DomainObjectOperation.changed or not isinstance(entity, Resource):
+        if operation != DomainObjectOperation.changed \
+        or not isinstance(entity, Resource) \
+        or not getattr(entity, 'url_changed', False):
             return
         context = {
             "ignore_auth": True,