MIP SV rank model blank "variant type" category

[dnil]

The "Variat type" category is no longer (?) used. It exists in the SV model only as an initial category mention. It could be useful, but not right now.

Having it like that gives a useless (also harmless) extra category in Scout:

[jemten]

Looks like it haven't been used for quite some time

[dnil]

@fellen31 just did in a Nallo version. 😸 We will need a new base url for those as well.