We use the ILL module but do not use the partner library feature as discussed here https://koha-community.org/manual/18.11/en/html/ILL_requests.html#place-request-with-partners-label However, if I select the first empty option in the ILLPartnerCode setting, a warning is present on the About > System Information tab: "The ILL module is enabled, but ILLPartnerCode system preference is empty. Falling back to the hardcoded 'IL'." We should be able to simply leave this preference null without seeing a warning, since the module functions without it and we are not using the feature.