Hi Rob, I'm afraid you cannot use null values in the predicate. You could consider using AdGroupAdService to get the ads and check if the trackingUrlTemplate <https://developers.google.com/adwords/api/docs/reference/v201705/AdGroupAdService.Ad#trackingurltemplate> is populated. If the trackingUrlTemplate is not set, the Ad Performance Report <https://developers.google.com/adwords/api/docs/appendix/reports/ad-performance-report> will contain two dashes (--) indicating that there is no value for this cell.
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