[O] Bug: ditaa breaks export [7.8.03]

[Ian Dalton]

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------------------------------------------------------------------------

When I run `emacs -q' and evaluate `(setq org-babel-load-languages
'((ditaa . t)))', then try to export an org document to PDF, after
answering yes to "Evaluate this ditaa code block", I get:

Wrong type argument: stringp, nil

Emacs  : GNU Emacs 24.0.93.1 (i486-pc-linux-gnu, GTK+ Version 2.20.1)
 of 2012-02-22 on cw-bkp0, modified by Debian
Package: Org-mode version 7.8.03

current state:
==============
(setq
 org-export-blocks '((src org-babel-exp-src-block nil)
                     (comment org-export-blocks-format-comment t)
                     (ditaa org-export-blocks-format-ditaa nil)
                     (dot org-export-blocks-format-dot nil))
 org-ctrl-c-ctrl-c-hook '(org-babel-hash-at-point
org-babel-execute-safely-maybe)
 org-export-preprocess-before-selecting-backend-code-hook
'(org-beamer-select-beamer-code)
 org-tab-first-hook '(org-hide-block-toggle-maybe
org-src-native-tab-command-maybe)
 org-cycle-hook '(org-cycle-hide-archived-subtrees org-cycle-hide-drawers
                  org-cycle-show-empty-lines
                  org-optimize-window-after-visibility-change)
 org-agenda-before-write-hook '(org-agenda-add-entry-text)
 org-speed-command-hook '(org-speed-command-default-hook
                          org-babel-speed-command-hook)
 org-babel-pre-tangle-hook '(save-buffer)
 org-occur-hook '(org-first-headline-recenter)
 org-export-interblocks '((lob org-babel-exp-lob-one-liners)
                          (src org-babel-exp-inline-src-blocks))
 org-metaup-hook '(org-babel-load-in-session-maybe)
 org-confirm-elisp-link-function 'yes-or-no-p
 org-export-latex-format-toc-function 'org-export-latex-format-toc-default
 org-export-preprocess-before-normalizing-links-hook
'(org-remove-file-link-modifiers)
 org-clock-out-hook '(org-clock-remove-empty-clock-drawer)
 org-export-first-hook '(org-beamer-initialize-open-trackers)
 org-mode-hook '(#[nil "\300\301\302\303\304$\207"
                   [org-add-hook change-major-mode-hook
org-show-block-all append
                    local]
                   5]
                 org-babel-hide-all-hashes)
 org-export-latex-final-hook '(org-beamer-amend-header org-beamer-fix-toc
                               org-beamer-auto-fragile-frames
                               org-beamer-place-default-actions-for-lists)
 org-export-latex-after-initial-vars-hook '(org-beamer-after-initial-vars)
 org-metadown-hook '(org-babel-pop-to-session-maybe)
 org-src-mode-hook '(org-src-babel-configure-edit-buffer
                     org-src-mode-configure-edit-buffer)
 org-after-todo-state-change-hook '(org-clock-out-if-current)
 org-confirm-shell-link-function 'yes-or-no-p
 )
-- 
Ian Dalton
Philosophy Undergraduate, SUU
408-838-4797 ~ http://www.linkedin.com/in/idalton