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Do not assume the scratch field is always present We have ran in production into a message that did not have the scratch field in the "artifact" section, thus breaking our consumer and doing so, the entire gating pipeline in Fedora. The message: https://apps.fedoraproject.org/datagrepper/id?is_raw=true&size=extra-large&id=2020-5626e1e7-4d8f-4acb-9a5e-d9dfe860a26e Signed-off-by: Pierre-Yves Chibon <pingou@pingoured.fr>