[Bugfix][MultiConnector] Fix MultiConnector for SupportsHMA sub-connectors (#36549)

vllm/distributed/kv_transfer/kv_connector/v1/nixl_connector.py

@@ -415,6 +415,14 @@ class NixlConnector(KVConnectorBase_V1, SupportsHMA):
         assert self.connector_scheduler is not None
         return self.connector_scheduler.build_connector_meta(scheduler_output)
 
+    def request_finished(
+        self,
+        request: "Request",
+        block_ids: list[int],
+    ) -> tuple[bool, dict[str, Any] | None]:
+        assert self.connector_scheduler is not None
+        return self.connector_scheduler.request_finished(request, (block_ids,))
+
     def request_finished_all_groups(
         self,
         request: "Request",