Comment 2 for bug 1714072

I think 400. Since we said you have to provide at least one resource provider:

https://review.openstack.org/#/c/490195/

It would be weird to say, OK you can set one provider but no resources. And if you don't want allocations for a given consumer on any provider, then DELETE /allocations/{consumer_id} is what you need.

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Also, I think we could use minProperties: 1 to fix this for the 'resources' key:

http://json-schema.org/latest/json-schema-validation.html#rfc.section.6.16