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Contextual filter Term OR Empty

I have a view using taxonomy CONTEXTUAL FILTERS.

  1. taxonomy vocab 1 terms AND
  2. taxonomy vocab 2 terms

Both are set to get the taxonomy id from the url, limited to a specific taxonomy vocabulary and share any of the terms.

But on taxonomy vocab 2, I would like to have an additional filter to pull content without any vocab 2 terms at all.

something along the lines of

  1. has taxonomy vocab 1 terms AND
  2. has taxonomy vocab 2 terms OR
  3. has NO taxonomy vocab 2 terms

I can do this with two separate views:

VIEW 1

  1. has taxonomy vocab 1 terms AND
  2. has taxonomy vocab 2 terms

VIEW 2

  1. has taxonomy vocab 1 terms AND
  2. has NO taxonomy vocab 2 terms

but I would like to combine the results.

Edit: if I have this set of content with terms, and the Contextual argument is term 1 I want the first and third to be shown in Views results:

content 1 | term 1
content 2 | term 2
content 3 | no term selected

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Contextual filter Term OR Empty

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