schema.org markup with anonymous/deleted users

[rrlevering]

I just noticed in our (Google) systems that we're not giving the best error feedback for a problem that we have with Xenforo markup with regards to deleted/removed users. Right now Xenforo is producing:
HTML:

itemid=""
in the Microdata markup when a user without a profile is found. This has the confusing effect of resolving the itemid to be empty string relative to the document URL which means it's the containing document URL. I think that's the correct interpretation or at least...

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schema.org markup with anonymous/deleted users

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