feat: 后台清单规则编辑器，excel中“工作内容”列中间有空行，批量复制粘到后台，应能正常把空格也粘过来，不应把后面的数据往上提。

web/maintain/bills_lib/scripts/db_controller.js

@@ -1018,7 +1018,7 @@ var tools = {
     for (let i = orgRow; i <= maxRow; i++) {
       let validData = {};
       for (let j = orgCol; j <= maxCol; j++) {
-        let value = sheet.getValue(i, j);
+        let value = sheet.getValue(i, j) || "";
         if (value) {
           if (setting.cols[j].data.field === "engineering") {
             if (!isNaN(value) && value % 1 === 0) {
@@ -1043,6 +1043,8 @@ var tools = {
           } else {
             validData[setting.cols[j].data.field] = value;
           }
+        } else {
+          validData[setting.cols[j].data.field] = value;
         }
       }
       if (!tools.isEmptyObj(validData)) {