修改实体位置

yzg-util-db/src/main/java/com/yanzuoguang/dao/impl/BaseDaoImpl.java

@@ -657,7 +657,7 @@ public abstract class BaseDaoImpl extends BaseDaoSql implements BaseDao {
     public <T extends Object> String setGroupId(T model) {
         // 判断前台实体
         if (model == null) {
-            return;
+            return StringHelper.EMPTY;
         }
 
         String md5Field = this.table.getTable().getMD5KeyName();