Can I get pageviews that don't have a value for a custom dimension in Google Analytics?

by Jasper Kennis   Last Updated January 11, 2018 14:04 PM

I'm trying to get an overview of pageviews that don't have a value for my custom dimension.

The purpose is to figure out why only 70% of users actually seem to get a value assigned to this dimension, because I'm trying to get it as close to 100% as possible.

Here's a screenshot of a config I've tried so far:

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