Merge branch 'xinyan' into test

src/views/reportManage/dataCenter/utils/columns.ts

@@ -313,7 +313,7 @@ function formatEmptyCell(cellValue) {
 }
 
 function formatRateCell(cellValue) {
-  if (cellValue ==='nan%'){
+  if (cellValue ==='nan%'|| cellValue === null || cellValue === undefined || cellValue === ''){
     return '--';
   }
   else {