修复V3空业务根回调处理

server/src/main/java/cn/nianxx/thhotel/workflows/reservation/service/impl/ReservationAiTaskIntakeServiceImpl.java

@@ -226,6 +226,9 @@ public class ReservationAiTaskIntakeServiceImpl implements ReservationAiTaskInta
         JsonNode messageEvents = root.path("message_events");
         JsonNode unhandledIntents = root.path("unhandled_current_intents");
         int itemCount = messageEvents.size() + unhandledIntents.size();
+        if (itemCount <= 0) {
+            throw error(HttpStatus.BAD_REQUEST, "TASK_RESULTS_EMPTY", "message_events 和 unhandled_current_intents 不能同时为空。");
+        }
         String requestPayloadSha256 = sha256(rawBody == null ? "" : rawBody);
         String batchIdempotencyKey = sha256(BATCH_KEY_PREFIX + "|" + sourceMessageId + "|" + requestPayloadSha256);