Web UI: origins returning 505: 'NoneType' object has no attribute 'split'
A number of origins fail to be rendered with HTTP response 505 and the message in title.
An example is https://archive.softwareheritage.org/browse/origin/https://github.com/WilsonSayresLab/Anole_expression/directory/
A longer list with ~200 origins is at software_heritage_http_code_500.txt
Migrated from T1301 (view on Phabricator)