Fixed error DOT field with Portugal locale

Author: AZiniukhin

app/code/Magento/Customer/Block/Widget/Dob.php

@@ -422,7 +422,8 @@ public function getTranslatedCalendarConfigJson(): string
                 'monthNamesShort' => array_values(iterator_to_array($monthsData['format']['abbreviated'])),
                 'dayNames' => array_values(iterator_to_array($daysData['format']['wide'])),
                 'dayNamesShort' => array_values(iterator_to_array($daysData['format']['abbreviated'])),
-                'dayNamesMin' => array_values(iterator_to_array($daysData['format']['short'])),
+                'dayNamesMin' => array_values(iterator_to_array(
+                    ($daysData['format']['short']) ?: $daysData['format']['abbreviated'])),
             ]
         );
     }