It doesn't have any, and worse, there's no currently active OpCode
symbol map that could be used to create strings from tokens.

Regression from

    commit bf1ffc64
    Date:   Sun Jul 16 15:18:09 2017 +0200

        FormulaDlg_Impl::UpdateValues: evaluate in force-array context if present

Change-Id: I77c2035fdd0926f67fcc85e7090f30485b4e312c