Add checks to avoid provenance and sbom post processing if not results were created #3805
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⬆️ Follow-up to #3462.
This fixes the panic that we can trigger in docker/buildx#1640 (comment).
This scenario would happen if we returned a result containing no refs, but the solve opt specified we should have some platforms, we'd still attempt to access them, and panic.
This is probably a candidate for cherry-picking.
cc @ktock