swagger-ui does generates error when response contains a schema with registry

[mcuervoe-np]

Thanks for such an amazing library. I use it in all my projects. In my latest, I am using malli extensively, and I found this problem with swagger-ui:

When a route contains a :responses with a schema that uses a local registry, the swagger-ui produces an error.

For example:

(def local-registry {::total :int})
(def Total (mc/schema [:map {:registry local-registry}
                        [:total ::total]]))

....
["/plus"
         {:get {:summary "plus with malli responses"
                :responses {200 {:body Total}}
                :handler (fn [_]
                           {:status 200
                            :body {:total 2}})}}]

When you open the swagger-ui in the browser, you get this error:

Resolver error at responses.200.content.application/json.schema.properties.total.$ref Could not resolve reference: Evaluation failed on token: "definitions"

I have tested with reitit versions "0.6.0" and "0.7.0-alpha3" with the same results.

I attached a modified version of the malli swagger example to make it easier to reproduce and a screenshot of the error.

server.zip