fix(zookeeper-query): 修复 get data 不判断地址是否存在

service-zookeeper-query/src/main/java/com/lanyuanxiaoyao/service/zookeeper/ZookeeperController.java

@@ -37,7 +37,11 @@ public class ZookeeperController {
 
     @GetMapping("get_data")
     public String getData(@RequestParam("path") String path) throws Exception {
-        return new String(client.getData().forPath(path));
+        if (existsPath(path)) {
+            return new String(client.getData().forPath(path));
+        } else {
+            return "";
+        }
     }
 
     @GetMapping("exists_lock")