Combined tags & duplicate content

How are y’all dealing with the issue of (and I’m only doing this for a small site for an artist) tags where we want the user to be able to select multiple tags, that will often result in ‘no results’ and I’m thinking that’s duplicate content.
I guess I could make the whole tag thing noindex, but I want the good searches to be indexed, that’s part of the point.
Thoughts?

 

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