revert-buffer fails in unibyte mode

[Roland Winkler]

I noticed the following bug after I installed the latest CVS emacs
today.

Start a fresh emacs --unibyte --no-init-file
Execute toggle-debug-on-error
Load a simple text file like
cat > foo << EOF
foo bar baz
EOF
On the command line execute "touch foo".
Revert buffer foo.
This gives me the backtrace

Debugger entered--Lisp error: (wrong-type-argument arrayp nil)
  coding-system-plist(nil)
  coding-system-get(nil alias-coding-systems)
  coding-system-base(nil)
  revert-buffer(t)
  call-interactively(revert-buffer)
  execute-extended-command(nil)
  call-interactively(execute-extended-command)



In GNU Emacs 22.0.90.1 (i686-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2006-11-09 on tfkp07
configured using `configure '--prefix=/nfs/tfkp07/winkler/emacs/NEW' 
'--with-gcc' '--with-pop' '--with-x' '--with-x-toolkit=athena''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: C
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_US.iso885915
  locale-coding-system: iso-8859-15
  default-enable-multibyte-characters: nil