更新readme文档

utils/llm_helper.py

@@ -75,7 +75,8 @@ class LLMHelper:
             else:
                 yaml_content = response.strip()
             
-            return yaml.safe_load(yaml_content)
+            parsed = yaml.safe_load(yaml_content)
+            return parsed if parsed is not None else {}
         except Exception as e:
             print(f"YAML解析失败: {e}")
             print(f"原始响应: {response}")