API: when taxon text search fails (taxon_name=), return zero taxa, not all taxa

This is based on discussion here (and prior):
https://forum.inaturalist.org/t/how-to-use-inaturalists-search-urls-wiki/63/219

Don’t know if current behavior is by design, so maybe this is a bug report instead of a feature request.

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An update: This seems to manifest only of there is no match for the taxon.

When other criteria do not match, but a taxon entry exists for the taxon, the query properly returns no results.

Yes, that is what I was seeing too, but it probably wasn’t clear enough in my original post.