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When I document a response body (using `returning(Status, Pair&lt;Lens&lt;T&gt;, T&gt;)`), I get an exception when one of the fields is `null` in the example (`NoFieldFound`).
It looks like a bug in `SimpleLookup`, where the field retriever does not distinguish between "the java getter is null" and "the value of the field retrieved by the getter is null" (<https://github.com/http4k/http4k/blob/bf722f2d8756c8ff3cd680e5d5ac3e124cb0c779/http4k-contract/src/main/kotlin/org/http4k/contract/openapi/v3/FieldRetrieval.kt#L35|https://github.com/http4k/http4k/blob/bf722f2d8756c8ff3cd680e5d5ac3e124cb0c779/htt[…]rc/main/kotlin/org/http4k/contract/openapi/v3/FieldRetrieval.kt>)