Capturig the Mod key only

[Stefan Geneshky]

Hi,

I am trying to capture the Mod key only. Replacing the other key with nil
or "" doesn't work:

awful.key({ modkey }, nil, function() end)
awful.key({ modkey }, nil, function() end)

The above does not work.
Does anyone know how to capture the Mod key only?

Thanks,
Stefan