23.0.60; Gnus gives wrong-type-argument with text/HTML

[Stephen Berman]

1. Start with -Q
2. M-x gnus
3. Browse nntp+news.gmane.org:gmane.emacs.devel
4. Try to open article 88513
<http://permalink.gmane.org/gmane.emacs.devel/88513>, which looks like
this in the default Gnus setup:
. [  37: Vinicius Jose Latorre  ] Re: 23.0.60; whitespace.el mishap

This is a MIME/multipart message with HTML, and trying to open it
results in "require: Wrong type argument: arrayp, nil".  The lisp
backtrace is attached (it contains bytecode). This does not
happen in pre-unicode-2 CVS Emacs.

Gnus-mime
Description: Gnus backtrace

In GNU Emacs 23.0.60.2 (i686-pc-linux-gnu, GTK+ Version 2.12.0)
 of 2008-02-07 on escher
Windowing system distributor `The X.Org Foundation', version 11.0.70200000
configured using `configure  '--enable-font-backend''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  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.UTF-8
  value of $XMODIFIERS: @im=local
  locale-coding-system: utf-8-unix
  default-enable-multibyte-characters: t