add：缓存中获取不到内容返回null

tr-modules/tr-module-system/src/main/java/cn/tr/module/sys/tenant/util/CacheUtil.java

@@ -26,7 +26,7 @@ public class CacheUtil {
 
     @Cacheable(value = "global:url:admin#604800",key = "#tenantId")
     public SysAdminAddCacheDTO getAdminCache(String tenantId){
-        return new SysAdminAddCacheDTO();
+        return null;
     }
     public void putPhoneCode(){