兼容，审批人，没有电子签名的情况

app/lib/rpt_data_analysis.js

@@ -1437,7 +1437,7 @@ const loadCooperationData = {
     },
     _completeSign: function (auditor) {
         if (!auditor || !auditor.end_time) return '';
-        return 'public/upload/sign/' + auditor.sign_path;
+        return auditor.sign_path ? 'public/upload/sign/' + auditor.sign_path : '';
     },
     _loadImCooperationData: function (ctx, data, options, csRela) {