Les expressions négatives

I thought the same as Jaya and Maarten, but what the lesson actually says is:

Ne ... ni ... ni = Neither ... nor (French Negations)

"Most of the time with ni with nouns, you omit the article when it comes right after ni, unless you're using a definite article (le, la, l', les)."

I can see from a Google search that there are many examples where the partitive article (or "de") is retained, so it's probably not incorrect. Maybe it adds emphasis? For example: 

"Nous ne voulons ni de l'Europe de Juncker, ni de l'Europe de Salvini et Orban"

"La Catalogne ne veut ni de proclamation d'indépendance unilatérale, ni l'article 155."

The first sentence is correct. Where did you see 'de' used ? Not on this site, I think.