[bug] args out of range upon meta-return in body of list item

[Samuel Wales <samologist@gmail.com>]

recent maint on emacs 25.

i know this is an imperfect bug report with no mce that you can
probably repro.  but perhaps it can trigger an idea that could lead
directly to a fix.  my brain and computer limitations cannot do better
at this time.

when i run m-ret at the caret i get this bt.  my intent is to make a
new list item containing prefer as its header.

   1) [ ] towels
      1) [ ] 12 very large (asdfasdf asdfasdf) solid color,
         like the ones i use, thick -- asdafsdf -- ^prefer
         to get them slightly wider
         - not any ...
         - not any pattern (something like different color on
           end might be ok, dunno) or anything garish
      2) [ ] 6 dark aasdfa dfnkajs dkfaskdf kasdn
         fkasdnkfanksdfn kasdfn
   2) asdfasdfasdf

Debugger entered--Lisp error: (args-out-of-range -1 3)
  replace-match("1) " nil nil nil 1)
  #[771 ...
  org-list-struct-apply-struct(...
  org-list-write-struct(...
  org-insert-item(nil)
  funcall-interactively(org-insert-item nil)
  call-interactively(org-insert-item)
  org-meta-return(nil)
  funcall-interactively(org-meta-return nil)
  call-interactively(org-meta-return nil nil)
  command-execute(org-meta-return)