org-babel: ensure that result is returned when using :results output

One half of this patch is a revert of c167a4ac32.

These changes are necessary so that :results output works correctly
with #+lob calls. For example the following example did not work:

--------------------------------------------------
3. :results output org -> doesn't work with #+lob:
--------------------------------------------------
\#+srcname: randthree(n,max)
\#+begin_src ruby
number = n
maximum = max
puts "* Random numbers\n" +
"Here are some random numbers: " +
(1..number).collect {|x| (rand * maximum).ceil }.join(", ") +
"."
\#+end_src

\#+lob: randthree(n=3,max=10) :results output org

contrib/babel/lisp/langs/org-babel-emacs-lisp.el

@@ -39,16 +39,13 @@
   "Execute a block of emacs-lisp code with org-babel.  This
 function is called by `org-babel-execute-src-block' via multiple-value-bind."
   (message "executing emacs-lisp code block...")
-  (case result-type
-    (output '())
-    (value (save-window-excursion
-             (let ((print-level nil) (print-length nil))
-               (eval `(let ,(mapcar (lambda (var) `(,(car var) ',(cdr var))) vars)
-                        ,(read (concat "(progn "
-                                       (if (or (member "code" result-params)
-                                               (member "pp" result-params))
-                                           (concat "(pp " body ")") body)
-                                       ")")))))))))
-
+  (save-window-excursion
+    (let ((print-level nil) (print-length nil))
+      (eval `(let ,(mapcar (lambda (var) `(,(car var) ',(cdr var))) vars)
+	       ,(read (concat "(progn "
+			      (if (or (member "code" result-params)
+				      (member "pp" result-params))
+				  (concat "(pp " body ")") body)
+			      ")")))))))
 (provide 'org-babel-emacs-lisp)
 ;;; org-babel-emacs-lisp.el ends here

contrib/babel/lisp/org-babel.el

@@ -189,7 +189,7 @@ the header arguments specified at the source code block."
     (if (eq result-type 'value)
         (setq result (org-babel-process-value-result result result-params)))
     (org-babel-insert-result result result-params)
-    (case result-type (output nil) (value result))))
+    result))
 
 (defun org-babel-load-in-session (&optional arg info)
   "Load the body of the current source-code block.  Evaluate the