fix pre-commit

api/core/workflow/nodes/list_operator/node.py

@@ -186,10 +186,10 @@ class ListOperatorNode(BaseNode):
             raise ValueError(f"Invalid serial index: must be >= 1, got {value}")
         value -= 1
         if len(variable.value) > int(value):
-            result = variable.value[value]
+            result = [variable.value[value]]
         else:
-            result = None
-        return variable.model_copy(update={"value": [result]})
+            result = []
+        return variable.model_copy(update={"value": result})
 
 
 def _get_file_extract_number_func(*, key: str) -> Callable[[File], int]:

api/core/workflow/nodes/tool/tool_node.py

@@ -317,7 +317,8 @@ class ToolNode(BaseNode):
             elif message.type == ToolInvokeMessage.MessageType.FILE:
                 assert message.meta is not None
                 assert isinstance(message.meta, dict)
-                assert "file" in message.meta and isinstance(message.meta["file"], File)
+                assert "file" in message.meta
+                assert isinstance(message.meta["file"], File)
                 files.append(message.meta["file"])
             elif message.type == ToolInvokeMessage.MessageType.LOG:
                 assert isinstance(message.message, ToolInvokeMessage.LogMessage)