I think I've confused myself here (not hard these days!), I have the
branch_4x code checked out, and that version definitely supports starting
Solr with no cores at all.  I still get an Admin UI and I can then use that
to create cores/collections starting from a clean slate.

Does that work in 4.4.0 or is it a yet to be released feature?

I saw the feature in 4.4.0:

* Added a new system wide info admin handler that exposes the system info
  that could previously only be retrieved using a SolrCore.

But that's not the same thing, right?  I tried starting a 4.4.0 setup with
0 core.properties files and get the (old) error & red box about no cores
are available, so the admin UI doesn't appear at all.

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