gitlab-shell compains "Error creating http client: cannot find cafile '': cafile not found"

git pull
remote: 
remote: ========================================================================
remote: 
remote: Error creating http client: cannot find cafile '': cafile not found
remote: 
remote: ========================================================================
remote: 
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.

That's when using the defaults in the example:

# See installation.md#using-https for additional HTTPS configuration details.
http_settings:
#  read_timeout: 300
#  user: someone
#  password: somepass
#  ca_file: /etc/ssl/cert.pem
#  ca_path: /etc/pki/tls/certs
  self_signed_cert: false

Uncommenting ca_file and pointing it to a real file makes it work again