add 网桥设备新增设备

jetlinks-manager/bridge-manager/src/main/java/org/jetlinks/community/bridge/server/aliyun/AliBridgeGateway.java

@@ -188,7 +188,7 @@ public class AliBridgeGateway{
             .filter(Boolean.FALSE::equals)
             .flatMap(ignore->delBridgeServer(oldNodeId,oldBridgeId))
             .concatWith(initBridge(bridge))
-            .then(Mono.just(getServer(bridge.getId())));
+            .then(Mono.justOrEmpty(getServer(bridge.getId())));
     }