Return the plain and html versions of our contents.

        Return: tuple
        Exceptions: None

def body(self, **kwargs):
        """
        Return the plain and html versions of our contents.

        Return: tuple
        Exceptions: None
        """
        text_content, html_content = None, None
        if self.plain:
            text_content = mold.cast(self.plain, **kwargs)
        if self.html:
            html_content = mold.cast(self.html, **kwargs)
        return text_content, html_content