dbnomics_solr_client_py: assert result.hits in {0, 1}
Several fetcher fail this assert:
- https://git.nomics.world/dbnomics-fetchers/bea-fetcher/-/jobs/754642
- https://git.nomics.world/dbnomics-fetchers/bdf-fetcher/-/jobs/755042
any many others
Edited by Michel Juillard