!725 更新 pr!723 xml

* update: 更新 mapper.xml ;
* update: 更新 FlowSpelBo 参数空值校验 ;

ruoyi-modules/ruoyi-workflow/src/main/resources/mapper/workflow/FlwSpelMapper.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<!DOCTYPE mapper
+    PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
+    "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
+<mapper namespace="org.dromara.workflow.mapper.FlwSpelMapper">
+
+</mapper>