`any(typedNilPtr)` wraps the nil pointer in a non-nil interface, so the
prior `closer != nil` check didn't catch it — calling Close on the
underlying nil *geoip.Databases segfaulted during the first successful
reload after a failed one.
Also flip form2mail's default blocklist URL from git@ (SSH) to
https:// so fresh deployments work without a GitHub SSH key.