CHW-4602 SettingsNoChange
settings payload contained no mutable fields; supply at least one field to update
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Default message: settings payload contained no mutable fields; supply at least one field to update
HTTP status:400(client)
Problem. A settings PATCH decoded as an empty object — no mutable
fields were supplied. Cause. The client sent a PATCH with {} (or
only fields the server ignores), so there is nothing to persist.
Fix. Include at least one of the documented mutable fields
(blocking_mode, anonymous_repo_access, release_min_age_days,
exception_age, block_contact_email, clamav, data_sources).
HTTP 400.