From mboxrd@z Thu Jan  1 00:00:00 1970
From: Michael Brand <michael.ch.brand@gmail.com>
Subject: Re: spreadsheet: empty field should be an empty field.
Date: Tue, 16 Sep 2014 11:56:54 +0200
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On Tue, Sep 16, 2014 at 11:42 AM, Thorsten Jolitz <tjolitz@gmail.com> wrote:
> 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

Yes, and I already documented the OP use case in the second example here:
http://orgmode.org/manual/Formula-syntax-for-Calc.html

Michael