[ISSUE #10598] Fix nacos-client get the wrong index of the nacos serv…

…er list when use nacos-address endpoint (#10599)

* fix nacos clent get the random index of nacos server list bug

* Update ServerListManager.java

client/src/main/java/com/alibaba/nacos/client/naming/core/ServerListManager.java

@@ -86,11 +86,10 @@ public ServerListManager(Properties properties) {
     public ServerListManager(NacosClientProperties properties, String namespace) {
         this.namespace = namespace;
         initServerAddr(properties);
-        if (!serverList.isEmpty()) {
-            currentIndex.set(new Random().nextInt(serverList.size()));
-        }
-        if (serverList.isEmpty() && StringUtils.isEmpty(endpoint)) {
+        if (getServerList().isEmpty() && StringUtils.isEmpty(endpoint)) {
             throw new NacosLoadException("serverList is empty,please check configuration");
+        } else {
+            currentIndex.set(new Random().nextInt(getServerList().size()));
         }
     }