fix python style check

api/core/llm_generator/llm_generator.py

@@ -1,4 +1,5 @@
 import json
+import json_repair
 import logging
 import re
 from typing import Optional, cast
@@ -18,13 +19,11 @@ from core.model_runtime.entities.llm_entities import LLMResult
 from core.model_runtime.entities.message_entities import SystemPromptMessage, UserPromptMessage
 from core.model_runtime.entities.model_entities import ModelType
 from core.model_runtime.errors.invoke import InvokeAuthorizationError, InvokeError
+from core.workflow.nodes.llm.exc import LLMNodeError
 from core.ops.entities.trace_entity import TraceTaskName
 from core.ops.ops_trace_manager import TraceQueueManager, TraceTask
 from core.ops.utils import measure_time
 from core.prompt.utils.prompt_template_parser import PromptTemplateParser
-import json_repair
-
-from core.workflow.nodes.llm.exc import LLMNodeError
 
 
 class LLMGenerator: