"foreman-maintain backup" fails on CentOS8 / Foreman 2.1.0rc* - Multiple Issues

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for the first issue, I guess it’s: Bug #30166: Backup fails with undefined method `[]' for nil:NilClass - Foreman Maintain - Foreman
for the wrong path, I’ve opened Bug #30323: assumes SCL paths for databases on EL8 - Foreman Maintain - Foreman