Hide rating key column on media export table

data/interfaces/default/info.html

@@ -906,6 +906,7 @@ DOCUMENTATION :: END
             }
         };
         export_table = $('#export_table-RK-${data["rating_key"]}').DataTable(export_table_options);
+        export_table.column(2).visible(false);
 
         var colvis = new $.fn.dataTable.ColVis(export_table, { buttonText: '<i class="fa fa-columns"></i> Select columns', buttonClass: 'btn btn-dark' });
         $(colvis.button()).appendTo('#button-bar-export');

data/interfaces/default/js/tables/export_table.js

@@ -57,7 +57,7 @@ export_table_options = {
             "targets": [2],
             "data": "rating_key",
             "createdCell": function (td, cellData, rowData, row, col) {
-                if (cellData !== '') {
+                if (cellData !== null) {
                     $(td).html('<a href="' + page('info', rowData['rating_key']) + '">' + cellData + '</a>');
                 }
             },