[None][fix] Return 3-tuple from check_gen_transfer_status fast path (#14162)

Signed-off-by: Xianjie Qiao <xqiao@nvidia.com>
Signed-off-by: Xianjie <5410381+qiaoxj07@users.noreply.github.com>

Author: qiaoxj07

tensorrt_llm/_torch/disaggregation/transceiver.py

@@ -518,7 +518,7 @@ def check_context_transfer_status(
     def check_gen_transfer_status(self, at_least_request_num: Optional[int]):
         # Skip the allgather in _gen_consensus when this transceiver never receives (pure CTX role).
         if not self._ever_had_recv_session:
-            return [], []
+            return [], [], []
         block_all = at_least_request_num is None
         wait_num = at_least_request_num if not block_all else 0