Actually, it's a typo. "were" should have been "where." I grovel at your feet for forgiveness.
And if you can't help yourself when you read poor grammar, you must spend a lot of time correcting posters on TSW.
But if it's the use of the singular verb with "none," I have to defer to my copy of the American Heritage Dictionary of the English Language (3rd Ed.): "either a singular or plural verb is acceptably used."
"Both are acceptable beyond serious criticism," says Merriam-Webster's Dictionary of English Usage.
Since the word is etymologically derived from the Old English word for "one" I prefer to use the singular verb. Sorry, but sometimes when someone says I'm wrong and I'm not ...