Subtree export of empty entry generates spurious letter

[Alain . Cochard]

Hello.  Reporting in case it is just a symptom that might
resurface in a realistic context.

With release_9.6-204-g2f7052.

I have file consisting only of

   #+options: toc:nil author:nil date:nil
   * foo
   * bar

I put the point on the 'foo' line and do 'C-c C-e C-s l o'.  The pdf
generated shows (without the dashes):

   -------------------------------
                 foo
   o
   --------------------------------

(In all cases I tried, it is the last letter of the healine that is
added.)



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