bug#2407: 23.0.90; Emacs chokes on empty command line argument

Please write in English if possible, because the Emacs maintainers
usually do not have translators to read other languages for them.

Your bug report will be posted to the [email protected] mailing list.

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

When running emacs with an empty command line argument like this:

emacs ''

it won't start and display the following message:

Option `' is ambiguous

This makes it impossible to just call emacs "$*" inside a shell script
(without checking if "$*" is an empty string).

If Emacs crashed, and you have the Emacs process in the gdb debugger,
please include the output from the following gdb commands:
    `bt full' and `xbacktrace'.
If you would like to further debug the crash, please read the file
/usr/share/emacs/23.0.90/etc/DEBUG for instructions.


In GNU Emacs 23.0.90.1 (i686-pc-linux-gnu, GTK+ Version 2.14.7)
 of 2009-02-17 on sascha-xps
Windowing system distributor `The X.Org Foundation', version 11.0.10502000
configured using `configure  '--prefix=/usr'
'--host=i686-pc-linux-gnu' '--mandir=/usr/share/man'
'--infodir=/usr/share/info' '--datadir=/usr/share' '--sysconfdir=/etc'
'--localstatedir=/var/lib' '--program-suffix=-emacs-23'
'--infodir=/usr/share/info/emacs-23' '--with-sound' '--with-x'
'--with-toolkit-scroll-bars' '--with-gif' '--with-jpeg' '--with-png'
'--with-rsvg' '--with-tiff' '--with-xpm' '--with-freetype'
'--with-xft' '--without-libotf' '--without-m17n-flt'
'--with-x-toolkit=gtk' '--without-hesiod' '--without-kerberos'
'--without-kerberos5' '--with-gpm' '--with-dbus'
'--build=i686-pc-linux-gnu' 'build_alias=i686-pc-linux-gnu'
'host_alias=i686-pc-linux-gnu' 'CFLAGS=-O2 -march=prescott -pipe'
'LDFLAGS=-Wl,-O1''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: de_DE.utf8
  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.utf8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default-enable-multibyte-characters: t

Major mode: Lisp Interaction

Minor modes in effect:
  eldoc-mode: t
  auto-complete-mode: t
  iswitchb-mode: t
  which-function-mode: t
  minibuffer-depth-indicate-mode: t
  recentf-mode: t
  icicle-mode: t
  show-paren-mode: t
  auto-dictionary-mode: t
  flyspell-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: -1
  global-auto-composition-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
<f1> <help-echo> <help-echo> <help-echo> <help-echo>
<help-echo> <help-echo> <menu-bar> <help-menu> <se
nd-emacs-bug-report>

Recent messages:
Loading /home/sascha/.emacs.d/site-lisp/auto-complete/auto-complete.el
(source)...done
Loading /home/sascha/.emacs.d/site-lisp/auto-complete/ac-dabbrev.el
(source)...done
Loading /home/sascha/.emacs.d/site-lisp/my-stuff/init.el (source)...done
Starting new Ispell process [default] ...
For information about GNU Emacs and the GNU system, type C-h C-a.
Menu-Bar mode enabled
Buffer dictionary was nil
Ispell process killed
Local Ispell dictionary set to en
Buffer dictionary is now en