Do not add url to visit twice in free url migration

import_md/hedgedoc_import.py

@@ -70,7 +70,6 @@ def process_archive_export(archive_file, instance_url, lookup_map, session_id, u
                 try:
                     new_url = import_single_document(instance_url, lookup_map[document_title], document_content,
                                                      session_id)
-                    urls_to_visit.append(new_url)
                     print(f"Migration was possible. New URL: {instance_url}/{lookup_map[document_title]}")
                 except HTTPError as error:
                     if error.status == 409: