解决计量系统电签失败后暂无pdf的问题

blade-service/blade-meter/src/main/java/org/springblade/meter/mapper/MaterialStartStatementMapper.xml

@@ -25,7 +25,7 @@
         <result column="pre_pdf_url" property="prePdfUrl"/>
     </resultMap>
     <select id="page2" resultType="org.springblade.meter.vo.MaterialStartStatementVO">
-        select IFNULL(pre_pdf_url,raw_url) as pre_pdf_url,mss.*,
+        select if(pre_pdf_url is null or pre_pdf_url = '',raw_url,pre_pdf_url) as pre_pdf_url,mss.*,
                (select id from u_task where form_data_id = mss.meter_period_id and is_deleted = 0 and status in (1,2)) as taskId
         from s_material_start_statement mss
         where contract_id = #{statement.contractId} and type = #{statement.type} and is_deleted = 0