bug#41145: 27.0.91; small issues with `display-fill-column-indicator' Customization group

[Philipp Stephani]

M-x customize-group RET display-fill-column-indicator RET, then expand
the section for `display-fill-column-indicator-character'.  The
customization buffer then contains:

Display Fill Column Indicator group:  Group definition missing. 
       State : visible group members are all at standard values.
   
[...]

Hide display-fill-column-indicator-character: nil
    State : STANDARD. (mismatch)
   Character to draw the indicator when ‘display-fill-column-indicator’ is 
non-nil. More

The two issues here are:

1. "Group definition missing."  It looks like customizing this group
   should load `display-fill-column-indicator-mode', which defines this
   group, or the group definition should be in cus-start.el.

2. "(mismatch)."  The default value for
   `display-fill-column-indicator-character' is nil, but its type is
   `character', so nil isn't allowed.


In GNU Emacs 27.0.91 (build 9, x86_64-pc-linux-gnu, GTK+ Version 3.24.13)
 of 2020-05-09
Repository revision: d5c184aa3e2a183144efa5f269e2c70d2681aa0a
Repository branch: emacs-27
Windowing system distributor 'The X.Org Foundation', version 11.0.12004000
System Description: Debian GNU/Linux rodete

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.

Configured using:
 'configure --enable-checking=all --enable-gtk-deprecation-warnings
 --enable-gcc-warnings=warn-only --enable-check-lisp-object-type
 --with-mailutils --without-pop 'CFLAGS=-O0 -g3' LDFLAGS=-g3'

Configured features:
XPM JPEG TIFF GIF PNG SOUND DBUS GSETTINGS GLIB NOTIFY INOTIFY
LIBSELINUX GNUTLS FREETYPE HARFBUZZ XFT ZLIB TOOLKIT_SCROLL_BARS GTK3
X11 XDBE XIM MODULES THREADS PDUMPER GMP

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message rmc dired dired-loaddefs
format-spec rfc822 mml easymenu mml-sec epa epg epg-config gnus-util
rmail rmail-loaddefs text-property-search time-date mm-decode mm-bodies
mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail
rfc2047 rfc2045 ietf-drums mm-util mail-prsvr mail-utils phst skeleton
derived edmacro kmacro pcase ffap thingatpt url url-proxy url-privacy
url-expand url-methods url-history url-cookie url-domsuf url-util
url-parse auth-source cl-seq eieio eieio-core cl-macs eieio-loaddefs
password-cache json map url-vars mailcap subr-x rx gnutls puny seq
byte-opt gv bytecomp byte-compile cconv dbus xml cl-loaddefs cl-lib
tooltip eldoc electric uniquify ediff-hook vc-hooks lisp-float-type
mwheel term/x-win x-win term/common-win x-dnd tool-bar dnd fontset image
regexp-opt fringe tabulated-list replace newcomment text-mode elisp-mode
lisp-mode prog-mode register page tab-bar menu-bar rfn-eshadow isearch
timer select scroll-bar mouse jit-lock font-lock syntax facemenu
font-core term/tty-colors frame minibuffer cl-generic cham georgian
utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean
japanese eucjp-ms cp51932 hebrew greek romanian slovak czech european
ethiopic indian cyrillic chinese composite charscript charprop
case-table epa-hook jka-cmpr-hook help simple abbrev obarray
cl-preloaded nadvice loaddefs button faces cus-face macroexp files
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote threads dbusbind
inotify dynamic-setting system-font-setting font-render-setting
move-toolbar gtk x-toolkit x multi-tty make-network-process emacs)

Memory information:
((conses 16 63403 5547)
 (symbols 48 8443 1)
 (strings 32 22409 1678)
 (string-bytes 1 711978)
 (vectors 16 12504)
 (vector-slots 8 174118 5994)
 (floats 8 25 34)
 (intervals 56 201 0)
 (buffers 1000 12))

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