[bug] COMMENT alone on heading ignored by new exporter

[Eric Fraga <e.fraga@ucl.ac.uk>]

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Hello,

I often use COMMENT in headlines to block out text that I don't want
exported.  This works generally very well.  However, sometimes I comment
a headline that has no headline text, as in "* COMMENT" alone.  These
sections are ignored properly by the old exporter but not the new one.

This is a minor bug; all you have to do is add any text after the
COMMENT.  I thought it would be easy to figure out where this is going
wrong but I was unable to.  Sorry!

Example org and exported tex files attached.

Thanks,
eric

PS - I've been silent on this list for months now; it's annoying how
work can interfere with what I would rather be doing... :(

-- 
: Eric S Fraga, GnuPG: 0xC89193D8FFFCF67D
: in Emacs 24.2.50.1 and Org release_7.9.1-225-ga5756f

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* first
  some text
* second
  some text which should appear in the new exporter
*** second first
    some text which should appear
*** COMMENT second third
    some text which should not appear
*** COMMENT 
    some text which should not appear *but* does actually appear unfortunately in the new exporter, although not in the old one.
* COMMENT third
  some text which should not appear

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% Created 2012-09-29 Sat 01:04
\documentclass{scrartcl}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{fixltx2e}
\usepackage{graphicx}
\usepackage{longtable}
\usepackage{float}
\usepackage{wrapfig}
\usepackage{soul}
\usepackage{textcomp}
\usepackage{marvosym}
\usepackage[integrals]{wasysym}
\usepackage{latexsym}
\usepackage{amssymb}
\usepackage{hyperref}
\tolerance=1000
\usepackage{xcolor}
\usepackage{listings}
\usepackage{amsmath}
\author{Eric Fraga}
\date{\today}
\title{comment}
\hypersetup{
  pdfkeywords={},
  pdfsubject={},
  pdfcreator={Generated by Org mode 7.9.1 in Emacs 24.2.50.1.}}
\begin{document}

\maketitle
\tableofcontents
\vspace*{1cm}

\section{first}
\label{sec-1}
some text

\section{second}
\label{sec-2}
some text which should appear in the new exporter
\subsection{second first}
\label{sec-2-1}
some text which should appear

\subsection{COMMENT}
\label{sec-2-2}
some text which should not appear \textbf{but} does actually appear unfortunately in the new exporter, although not in the old one.
% Generated by Org mode 7.9.1 in Emacs 24.2.50.1.
\end{document}