Fix unset error output stream

This change fixed the below error I got:
Catchable fatal error:  Argument 2 passed to DefaultLogger::printMessage() must be an instance of OutputStream, null given, called in C:\xampp\htdocs\valid4life\deploy\vendor\phing\phing\classes\phing\listener\DefaultLogger.php on line 244 and defined in C:\xampp\htdocs\valid4life\deploy\vendor\phing\phing\classes\phing\listener\DefaultLogger.php on line 277