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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_help_html(message=None):
 """Create the HTML content for the help dialog or for external browser :param message: An optional message object to display in the dialog. :type message: Message.Message :return: the help HTML content :rtype: str """


    html = html_help_header()

    if message is None:
        message = dock_help()

    html += message.to_html()
    html += html_footer()
    return html