Error 500 on https://org-id.guide/_update_lists

[markbrough]

To workaround issue #256:

Code for IATI's codelists-updater hits https://org-id.guide/_update_lists a few times in order to make sure the data is up to date, when generating the OrganisationRegistrationAgency codelist.

However, that URL is currently serving a 500 error.