[BugFix] Avoid error traceback in logs when V1 `LLM` terminates (#13565)

Signed-off-by: Nick Hill <nhill@redhat.com>

vllm/v1/engine/core_client.py

@@ -252,6 +252,7 @@ class SyncMPClient(MPClient):
         outputs_queue = self.outputs_queue
 
         def process_outputs_socket():
+            try:
                 while True:
                     (frame, ) = output_socket.recv_multipart(copy=False)
                     outputs = decoder.decode(frame.buffer)
@@ -260,6 +261,9 @@ class SyncMPClient(MPClient):
                                                 utility_results)
                     else:
                         outputs_queue.put_nowait(outputs)
+            except zmq.error.ContextTerminated:
+                # Expected when the class is GC'd / during process termination.
+                pass
 
         # Process outputs from engine in separate thread.
         Thread(target=process_outputs_socket, daemon=True).start()