CSO - download fails: StopIteration
https://git.nomics.world/dbnomics-fetchers/cso-fetcher/-/jobs/161015#L1599
1599 INFO: * Generating category tree ...
1600 Traceback (most recent call last):
1601 File "download.py", line 262, in <module>
1602 sys.exit(main())
1603 File "download.py", line 87, in main
1604 category_tree = get_category_tree(html_tree)
1605 File "download.py", line 205, in get_category_tree
1606 first_node = next(tree_divs_iter)
1607 StopIteration