Use case is call dot babel from elisp code block. refer to
http://orgmode.org/worg/org-tutorials/org-dot-diagrams.html

Below is a more minimal example:

#+NAME: nodes
| From | To | Weight |
|------+----+--------|
| A    | B  |      3 |
| A    | C  |      2 |
| B    | D  |      4 |
| B    | E  |      5 |
| C    | F  |     10 |

#+BEGIN_SRC elisp :file a.png :var nodes=nodes
    (defun rowfun(x)
        (format "%s -> %s [label=%s];" (nth 0 x) (nth 1 x) (nth 2 x))
        )
      (defun dotgen(nodes)
        (let ((dotbegin "digraph {\nnode [shape=circle]\n")
              (dotend "\n}"))
          (concat dotbegin
                  (mapconcat #'rowfun nodes "\n")
                  dotend)))
(setq params (nth 2 (org-babel-get-src-block-info)))
  (org-babel-execute:dot (dotgen nodes) params)
#+END_SRC

If run this block with C-c C-c, it will generate a image a.png with
"nil" string in it. so it's a invalid image file.

The issue is introduced by below commit:

041ca4b6f ob-core: Do not return results on writing to file

After revert this commit, it works fine. Sounds like this change will
cause the function return "nil" string but not nil variable.

Another probelm is the params variable is void in org 9.0.5. but we can
replace it with (nth 2 (org-babel-get-src-block-info)) as my example
code.

BRs
J.J. Wang

In GNU Emacs 25.2.1 (x86_64-apple-darwin16.0.0, NS appkit-1504.00 Version 10.12 (Build 16A323))
of 2017-04-03 built on e12714-mac01
Windowing system distributor 'Apple', version 10.3.1504
Configured using:
'configure --disable-dependency-tracking --disable-silent-rules
--enable-locallisppath=/usr/local/share/emacs/site-lisp
--infodir=/usr/local/Cellar/emacs/25.2-rc2/share/info/emacs
--prefix=/usr/local/Cellar/emacs/25.2-rc2 --without-x --with-xml2
--with-dbus --with-gnutls --with-imagemagick --with-rsvg --without-pop
--with-ns --disable-ns-self-contained'

Configured features:
JPEG RSVG IMAGEMAGICK DBUS NOTIFY ACL GNUTLS LIBXML2 ZLIB
TOOLKIT_SCROLL_BARS NS

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

Major mode: Org

Minor modes in effect:
  diff-auto-refine-mode: t
  org-indent-mode: t
  helm-mode: t
  shell-dirtrack-mode: t
  async-bytecomp-package-mode: t
  yas-global-mode: t
  yas-minor-mode: t
  global-company-mode: t
  company-mode: t
  override-global-mode: t
  show-paren-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-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
  auto-fill-function: yas--auto-fill
  transient-mark-mode: t

Recent messages:
Code block evaluation complete.
Edebug: org-babel-result-cond
org-babel-result-cond
executing Elisp code block...

(nodes (quote (("A" "B" 3) ("A" "C" 2) ("B" "D" 4) ("B" "E" 5) ("C" "F" 10))))

Wrote /var/folders/r0/58rd7gbs3pz3gsj48zdv8pwn00n31m/T/babel-30327L5l/ob-input-30327wiQ
Code block evaluation complete.
Mark set [2 times]
Quit

Load-path shadows:
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Features:
(shadow sort mail-extr emacsbug message rfc822 mml mml-sec epg mm-decode
mm-bodies mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader
sendmail rfc2047 rfc2045 ietf-drums mail-utils ido helm-command
helm-elisp helm-eval edebug misearch multi-isearch vc-git diff-mode
winner org-table company-ispell ispell org-indent image-file org-rmail
org-mhe org-irc org-info org-gnus org-docview doc-view jka-compr
image-mode org-bibtex bibtex org-bbdb org-w3m company-oddmuse
company-keywords company-etags etags xref project company-gtags
company-dabbrev-code company-dabbrev company-files company-capf
company-cmake company-xcode company-clang company-semantic company-eclim
company-template company-css company-nxml company-bbdb ob-latex ob-C
cc-mode cc-fonts cc-guess cc-menus cc-cmds cc-styles cc-align cc-engine
cc-vars cc-defs ob-calc calc-store calc-trail calc-ext calc
calc-loaddefs calc-macs ob-dot ob-plantuml ob-python org-crypt ox-gfm
ox-md ox-odt rng-loc rng-uri rng-parse rng-match rng-dt rng-util
rng-pttrn nxml-parse nxml-ns nxml-enc xmltok nxml-util ox-latex
ox-icalendar ox-html table ox-ascii ox-publish ox org-element avl-tree
org org-macro org-footnote org-pcomplete org-list org-faces org-entities
noutline outline org-version ob-emacs-lisp ob ob-tangle org-src ob-ref
ob-lob ob-table ob-keys ob-exp ob-comint ob-core ob-eval org-compat
org-macs org-loaddefs find-func cal-menu calendar cal-loaddefs
setup-helm-gtags helm-gtags subr-x pulse which-func imenu setup-helm
helm-projectile projectile grep ibuf-ext ibuffer helm-mode helm-files rx
image-dired tramp tramp-compat tramp-loaddefs trampver shell pcomplete
format-spec dired-x dired-aux ffap thingatpt helm-buffers helm-elscreen
helm-tags helm-bookmark helm-adaptive helm-info bookmark pp helm-locate
helm-external helm-net browse-url xml url url-proxy url-privacy
url-expand url-methods url-history url-cookie url-domsuf url-util
url-parse auth-source gnus-util mm-util help-fns mail-prsvr
password-cache url-vars mailcap helm-types helm-grep helm-regexp
helm-utils compile comint ansi-color ring helm-help helm helm-source
eieio-compat eieio eieio-core helm-multi-match helm-config helm-easymenu
cl-macs async-bytecomp advice async helm-lib dired cl-seq yasnippet
init-company-mode lazy-set-key company use-package diminish bind-key
easy-mmode paren manoj-dark-theme misterioso-theme edmacro kmacro
finder-inf info package epg-config seq byte-opt gv bytecomp byte-compile
cl-extra help-mode easymenu cconv cl-loaddefs pcase cl-lib time-date
mule-util tooltip eldoc electric uniquify ediff-hook vc-hooks
lisp-float-type mwheel ns-win ucs-normalize term/common-win tool-bar dnd
fontset image regexp-opt fringe tabulated-list newcomment elisp-mode
lisp-mode prog-mode register page menu-bar rfn-eshadow timer select
scroll-bar mouse jit-lock font-lock syntax facemenu font-core frame
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 charscript
case-table epa-hook jka-cmpr-hook help simple abbrev minibuffer
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 dbusbind kqueue cocoa
ns multi-tty make-network-process emacs)

Memory information:
((conses 16 550219 22768)
(symbols 48 48191 0)
(miscs 40 216 1037)
(strings 32 125351 17559)
(string-bytes 1 3803442)
(vectors 16 73192)
(vector-slots 8 1151281 9870)
(floats 8 921 370)
(intervals 56 1485 323)
(buffers 976 25))