bugfix: 隐藏历史记录时程序崩溃

modules/utils.py

@@ -391,7 +391,7 @@ def get_file_names_by_last_modified_time(dir, filetypes=[".json"]):
 def get_history_names(user_name=""):
     logging.debug(f"从用户 {user_name} 中获取历史记录文件名列表")
     if user_name == "" and hide_history_when_not_logged_in:
-        return ""
+        return [""]
     else:
         history_files = get_file_names_by_last_modified_time(os.path.join(HISTORY_DIR, user_name))
         history_files = [f[:f.rfind(".")] for f in history_files]