Resolve Refresh Statistics: Updated At = Null should be display as "Never" instead of "undefined". issue25931

Author: edenduong

app/code/Magento/Reports/Controller/Adminhtml/Report/AbstractReport.php

@@ -140,7 +140,7 @@ protected function _showLastExecutionTime($flagCode, $refreshCode)
         $flag = $this->_objectManager->create(\Magento\Reports\Model\Flag::class)
             ->setReportFlagCode($flagCode)
             ->loadSelf();
-        $updatedAt = 'undefined';
+        $updatedAt = __('Never');
         if ($flag->hasData()) {
             $updatedAt = $this->timezone->formatDate(
                 $flag->getLastUpdate(),

app/code/Magento/Reports/i18n/en_US.csv

@@ -224,3 +224,5 @@ Action,Action
 Report,Report
 Description,Description
 undefined,undefined
+Never,Never
+

app/code/Magento/Reports/view/adminhtml/layout/reports_report_statistics_index.xml

@@ -71,7 +71,7 @@
                                 <argument name="sortable" xsi:type="string">0</argument>
                                 <argument name="id" xsi:type="string">updated_at</argument>
                                 <argument name="index" xsi:type="string">updated_at</argument>
-                                <argument name="default" xsi:type="string" translate="true">undefined</argument>
+                                <argument name="default" xsi:type="string" translate="true">Never</argument>
                                 <argument name="column_css_class" xsi:type="string">col-period</argument>
                                 <argument name="header_css_class" xsi:type="string">col-period</argument>
                             </arguments>