phpbb_notification_method_email::is_available() should return false when user doesn't have an email address

class phpbb_notification_method_email extends phpbb_notification_method_base
{
	/**
	* Get notification method name
	*
	* @return string
	*/
	public function get_type()
	{
		return 'email';
	}

	/**
	* Is this method available for the user?
	* This is checked on the notifications options
	*/
	public function is_available()
	{
		return (bool) $this->config['email_enable'];
	}

class phpbb_notification_method_jabber extends phpbb_notification_method_messenger_base
{
	/**
	* Get notification method name
	*
	* @return string
	*/
	public function get_type()
	{
		return 'jabber';
	}

	/**
	* Is this method available for the user?
	* This is checked on the notifications options
	*/
	public function is_available()
	{
		return ($this->global_available() && $this->user->data['user_jabber']);
	}