issue with a font with no features

Dear list,

I have a couple of fonts (https://www.dafont.com/sv-basic-manual.font)
which contain no GPOS/GSUB features.

I mean, the following command gives nothing as a result:

  otfinfo -f ~/many-fonts/SVBManual.ttf

But I get an error such as

  tex error       > tex error on line 6 in file :

  lua error:
    …font-ctx.lmt:2483: attempt to index a nil value (field 'gpos')

Well, the minimal function reads on my end (font-ctx.lmt):

    function constructors.currentfonthasfeature(n)
        local f = fontdata[currentfont()]
        if not f then return end f = f.shared
        if not f then return end f = f.rawdata
        if not f then return end f = f.resources
        if not f then return end f = f.features
        return f and (f.gpos[n] or f.gsub[n])
    end

I guess that lacking features is a problem with checking whether a font
has a given feature.

I need to compile the original document ASAP. Is there an easy fix to
make these fonts work?

Many thanks for your help,

Pablo
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