AbstractXml destructor emiting a warning (again and with fix)

[mariopereiraBnext]

The problem in issue AbstractXml destructor emiting a warning is back, even with the fix.

The same message of XMLWriter::flush(): Invalid or uninitialized XMLWriter object is still poping up in vendor\200mph\tnt-express-connect\src\service\ShippingService\entity\AbstractXml.php

I've made a composer update and can't see any changes except for the fixes of issues 33 and 34, but the warning is back.

I had to change the method to the following:

/**
 * Flush XML memory when destruct object
 */
public function __destruct()
{
    set_error_handler(function() {});

    if($this->xml instanceof MyXMLWriter) {
        $this->xml->flush();
    }

    restore_error_handler();
}

Basically, I had to shut down error handling for the method.
This works, but I haven't had time to check for bad side effetcts.