Create fake flags field

The content is empty for now, but at least the code will not emit
warnings on every access to it (which is quite often). The proper value
calculation should be added later.

libraries/dbi/mysql.dbi.lib.php

@@ -434,7 +434,9 @@ function PMA_DBI_get_fields_meta($result)
     $fields       = array();
     $num_fields   = mysql_num_fields($result);
     for ($i = 0; $i < $num_fields; $i++) {
-        $fields[] = mysql_fetch_field($result, $i);
+        $field = mysql_fetch_field($result, $i);
+        $field->flags = '';
+        $fields[] = $field;
     }
     return $fields;
 }