texi2html fails on empty macro

[Werner LEMBERG]

[texi2html.pl,v 1.237 2008/09/25]

Using an empty macro defined with

  @macro foo
  @end macro

makes texi2html fail with

  Modification of non-creatable array value attempted,
  subscript -1 at texi2html line 19323.

This happens in function `expand_macro',

  if (chomp($last_line))
  {
    push @result, $end_line;
  }
  else
  {
    $result[-1] .= $end_line;         <== here
  }

Looking into the current CVS version it seems the error is still
present.


     Werner