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Domain Source ID views handler should say "Active domain" when domain_id == DOMAIN_SETTINGS_ALL_DOMAINS or else not emit an empty link, breaking the empty field handling.
How to repeat:
Create a view, add the "Domain Source: Domain Source ID" field, select the "link to sitename" option, set some alternate empty text, include a record with a source domain of "use active domain". Observe the resulting records shows nothing on screen, and the HTML is an empty A tag.