建行校验：收款核销测试问题修复

src/main/webapp/modules/csh/CSH531N/csh_write_off_interface.lview

@@ -544,7 +544,7 @@
                     para: datas,
                     success: function(res) {
                         Leaf.Masker.unmask(Ext.getBody());
-                        if(res.result.record[0] != undefined){
+                        if(res.result.record[0] != undefined && res.result.record[0].p_err_msg !=undefined){
                             if(res.result.record[0].p_err_msg){
                                 var message='';
                                 for(var i=0;i<res.result.record.length;i++){