Fix Taxon taxonomy id validation regression #5189
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Summary
Fixes #5187.
In v3.4 I added optional Taxon validations which become mandatory in v4.0. This caused a regression which made all root taxons with children always invalid. This is a fix for v4, another PR for v3.4 was made:
#5190
This optional validation for root taxons (parent_id is nil), was
checking for uniqueness of taxonomy_id among all Taxons. This is wrong
however, as the children Taxons of this root Taxon will point to the
same Taxonomy. Instead, we should only look among other root Taxons.
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