Get or create the dashboard comment in this issue.

def get_or_create(cls, issue, header, text=None):
        """Get or create the dashboard comment in this issue.
        """
        for comment in get_comments(issue):
            try:
                if comment.body.splitlines()[0] == header:
                    obj = cls(comment, header)
                    break
            except IndexError: # The comment body is empty
                pass
        # Hooooooo, no dashboard comment, let's create one
        else:
            comment = create_comment(issue, header)
            obj = cls(comment, header)
        if text:
            obj.edit(text)
        return obj