Fixes #6891: Taxonomies couldn't be seeded after initial run of seeds.
On a clean run of seeds, a seed prior to the taxonomies sets User.current. On subsequent runs, errors are thrown since User.current is not thrown and taxonomy creation expects this.
Related issues
Bug #6891: rake db:seed failure on creating organization
Fixes #6891: Taxonomies couldn't be seeded after initial run of seeds.
On a clean run of seeds, a seed prior to the taxonomies sets User.current.
On subsequent runs, errors are thrown since User.current is not thrown
and taxonomy creation expects this.