fix send timeout messages

Author: RenameMe1

litestar/response/streaming.py

@@ -53,7 +53,7 @@ def __init__(
         is_head_response: bool = False,
         media_type: MediaType | str | None = None,
         status_code: int | None = None,
-        timeout: int | None = None,
+        timeout: int | None = 0,
     ) -> None:
         """A low-level ASGI streaming response.
 
@@ -127,7 +127,7 @@ async def _stream(self, send: Send) -> None:
         Returns:
             None
         """
-        if self.timeout is not None:
+        if self.timeout:
             await self._stream_with_timeout_events(send)
         else:
             async for chunk in self.iterator:
@@ -165,6 +165,7 @@ async def _stream_with_timeout_events(self, send: Send) -> None:
                         "body": b"timeout ping\n",
                         "more_body": True,
                     }
+                    await send(stream_event)
 
             try:
                 chunk = task.result()