fix(langgraph): fallback to event name when ToolMessage.name is None in normal branch (#1404)

Author: ranst91

integrations/langgraph/python/ag_ui_langgraph/agent.py

@@ -942,7 +942,7 @@ async def _handle_single_event(self, event: Any, state: State) -> AsyncGenerator
                     ToolCallStartEvent(
                         type=EventType.TOOL_CALL_START,
                         tool_call_id=tool_call_output.tool_call_id,
-                        tool_call_name=tool_call_output.name,
+                        tool_call_name=tool_call_output.name or event.get("name", ""),
                         parent_message_id=tool_call_output.id,
                         raw_event=event,
                     )