Re: texinfo4.5.90 pretest available

        (gdb) r lilypond-internals.nexi
        Starting program: /var/fred/cvs/savannah/texinfo/texinfo/makeinfo/makeinfo lilypond-internals.nexi

        Program received signal SIGSEGV, Segmentation fault.
        0x0804e24a in sort_index (index=0x0) at index.c:638

I think/hope this was an easy one, just failed to protect when there's
an empty index.  Patch follows.

I hope to make another pretest tomorrow.

Thanks Jan.

*** index.c.~1.7.~	Sat May 10 08:56:01 2003
--- index.c	Fri May 16 16:49:52 2003
***************
*** 634,641 ****
    make_index_entries_unique (array, count);
  
    /* Replace the original index with the sorted one, in case the
!      document wants to print it again.  */
!   *index = **array;
  
    return array;
  }
--- 634,642 ----
    make_index_entries_unique (array, count);
  
    /* Replace the original index with the sorted one, in case the
!      document wants to print it again.  If the index wasn't empty.  */
!   if (index)
!     *index = **array;
  
    return array;
  }