Clear conversation on premature exit

Author: sjmonson

src/guidellm/scheduler/worker.py

@@ -399,6 +399,8 @@ async def _process_next_request(self) -> ProcessRequestT[RequestT, ResponseT]:
                     request_info.error = "Request was cancelled"
                     request_info.scheduler_timings.resolve_end = time.time()
                     self._send_update("cancelled", response, request, request_info)
+                # Clear conversation on premature exit
+                conversation = []
 
         return history, conversation, aug