fix: Set landing page empty if it now in new dict

ckanext/geocat/harvester.py

@@ -294,15 +294,25 @@ def import_stage(self, harvest_object):  # noqa
                 context['schema'] = schema
                 schema['__junk'] = [ignore]
                 pkg_dict['name'] = pkg_info.name
+
                 pkg_dict['id'] = pkg_info.package_id
+
                 existing_package = map_resources_to_ids(
                     pkg_dict,
                     pkg_info.package_id
                 )
+
+                # Ensure 'url' is set to "" if it's not in pkg_dict
+                existing_url = existing_package.get("url")
+                new_url = pkg_dict.get("url")
+                if new_url is None and new_url != existing_url:
+                    existing_package["url"] = ""
+
                 package_changed, msg = check_package_change(
                     existing_package,
                     pkg_dict
                 )
+
                 if package_changed:
                     create_activity(package_id=pkg_dict['id'], message=msg)
                 updated_pkg = \