处理查询结果为null导致报错的问题

cloud-common-plugin-oauth/src/main/java/com/cm/common/plugin/utils/RestTemplateUtil.java

@@ -231,6 +231,9 @@ public class RestTemplateUtil {
         String response = responseEntity.getBody();
         if (HttpStatus.OK.value() == responseEntity.getStatusCodeValue()) {
             LOG.debug(">>>> 返回结果: {}", response);
+            if (response == null) {
+                return new JSONObject().toJSONString();
+            }
             return response;
         } else if (HttpStatus.UNAUTHORIZED.value() == responseEntity.getStatusCodeValue()) {
             return null;