From mboxrd@z Thu Jan  1 00:00:00 1970
From: Uwe Brauer <oub@mat.ucm.es>
Subject: Re: spreadsheet: empty field should be an empty field.
Date: Tue, 16 Sep 2014 13:02:16 +0200
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   > Uwe Brauer <oub@mat.ucm.es> writes:

   > I think something like NaN was introduced to Org-tbls, but I don't
   > remember the exact syntax, maybe try with 'nan':

   > Http://lists.gnu.org/archive/html/emacs-orgmode/2012-12/msg00983.html

Aha, so I would indeed get:

| Name   | Ex 1 | Ex2 | Ex + Ex2 |
| smith  |    1 |   2 |        3 |
| miller |      |     |          |
#+TBLFM: $4=$2+$3

this is patch is from 2012, which orgmode version did it enter then?

Uwe Brauer