合同变更工作流页面优化

src/main/webapp/modules/cont/CON731/hls_con_contract_change_detail.lview

@@ -52,10 +52,11 @@
             }
             //让历史信息查询
             var history_con_id=get_dsid_by_tabcode_basetable(window['${/parameter/@layout_code}_layoutDataSetList'], 'T_HISTORY_INGO', 'hls_bp_master');
+            if($(history_con_id)){
                 var url = '${/request/@context_path}/autocrud/prj.PRJ501N.prj_project_history_display/query?bp_id=${/parameter/@bp_id}';
                 $(history_con_id).setQueryUrl(url);
                 $(history_con_id).query();
-
+            }
             if('${/model/get_contract_division/record/@division}' !='70' && '${/model/get_contract_division/record/@division}' != ''){
             if(document.getElementById("CON_ET_MODIFY_F_QUOTATION_01_CON_CONTRACT_CHANGE_REQ_DEPOSIT_BALANCE")){
             document.getElementById("CON_ET_MODIFY_F_QUOTATION_01_CON_CONTRACT_CHANGE_REQ_DEPOSIT_BALANCE_prompt").style.display = "none";