Finding articles without taxonomy terms

How would I construct a {{ collection }} tag that found articles (or whatever) that had no terms in a given taxonomy?

I have a taxonomy for article "series" and on the article index I first list the series alphabetically. Then I'd like to list articles that aren't in a series. Right now there are none, and it looks dumb because I have a header with nothing following.

Right now, I use the following to filter out any articles that appear in a series:

{{ collection:articles as="articles" }}
    {{ articles scope="tag" }}
    {{ unless series }}
        {{ partial:article-list-item }}
    {{ /unless }}
    {{ /articles }}
{{ /collection:articles }}

This works, but it's less than ideal, because I have no way to know whether the collection is empty.


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