优化代码

@@ -70,6 +70,9 @@ public class NodePm2Task {
                         logger.info("cron_task_node_mem for ip {} ,name {}  ",ip,pythonEnv.getName());
 
                         String result = httpRestClientService.doGet("http://" + ip + ":9615", null);
+                        if(result==null){
+                            continue;
+                        }
                         JSONObject resultJSONObject = JSON.parseObject(result);
                         JSONObject monit = resultJSONObject.getJSONObject("monit");
                         long freeMem = monit.getLongValue("free_mem")/(1024 * 1024);