src/Ease/Mailer.php
public function isEmpty($element = null)
    {
        if (is_null($element)) {
            $element = $this->htmlBody;
        }
        return parent::isEmpty($element);
    }
public function isEmpty($element = null)
    {
        if (is_null($element)) {
            $element = $this->htmlBody;
        }
        return parent::isEmpty($element);
    }
Is object empty ?

@param Container $element

@return boolean