Bug: Problem with ido-completing-read from org-table-export

[Gregory Grubbs <gregory@dynapse.com>]

When exporting a table with ido-mode active, an error is raised in
org-ido-completing-read.  I think ido-completing-read is being called
with incorrect arguments, but the fix is beyond me.

Steps to reproduce the error:
Org-mode version: 6.28trans
Emacs version: GNU Emacs 23.0.91.1 (i486-pc-linux-gnu, GTK+ Version
2.16.0) of 2009-04-05 on palmer, modified by Debian


Turn on ido-mode: M-x ido-mode RET
visit a file using C-x C-f /tmp/test.org RET
Create a simple table:
|column a|column b|
|-
|one|two|
|three|four|

Org-magic-tabelize it by hitting TAB somewhere in a column

M-x org-table-export RET /tmp/test.csv

Here's the backtrace I get:

Debugger entered--Lisp error: (wrong-type-argument listp "orgtbl-to-tsv")
  #[(x) "\b@" [x] 1]("orgtbl-to-tsv")
  mapcar(#[(x) "\b@" [x] 1] ("orgtbl-to-tsv" "orgtbl-to-csv"
"orgtbl-to-latex" "orgtbl-to-html" "orgtbl-to-generic"
"orgtbl-to-texinfo" "orgtbl-to-orgtbl"))
  org-ido-completing-read("Format: " ("orgtbl-to-tsv" "orgtbl-to-csv"
"orgtbl-to-latex" "orgtbl-to-html" "orgtbl-to-generic"
"orgtbl-to-texinfo" "orgtbl-to-orgtbl") nil nil "orgtbl-to-tsv")
  apply(org-ido-completing-read ("Format: " ("orgtbl-to-tsv"
"orgtbl-to-csv" "orgtbl-to-latex" "orgtbl-to-html" "orgtbl-to-generic"
"orgtbl-to-texinfo" "orgtbl-to-orgtbl") nil nil "orgtbl-to-tsv"))
  org-completing-read("Format: " ("orgtbl-to-tsv" "orgtbl-to-csv"
"orgtbl-to-latex" "orgtbl-to-html" "orgtbl-to-generic"
"orgtbl-to-texinfo" "orgtbl-to-orgtbl") nil nil "orgtbl-to-tsv")
  org-table-export()
  call-interactively(org-table-export t nil)
  execute-extended-command(nil)
  call-interactively(execute-extended-command nil nil)
  recursive-edit()
  byte-code("Æ\x10    @Ç=!