Optimize error log

lightrag/lightrag.py

@@ -1114,9 +1114,11 @@ class LightRAG:
                 llm_response_cache=self.llm_response_cache,
             )
         except Exception as e:
-            logger.error(
-                f"Failed to extract entities and relationships : {traceback.format_exc()}"
-            )
+            error_msg = f"Failed to extract entities and relationships: {str(e)}"
+            logger.error(error_msg)
+            async with pipeline_status_lock:
+                pipeline_status["latest_message"] = error_msg
+                pipeline_status["history_messages"].append(error_msg)
             raise e
 
     async def _insert_done(