[Go] codegen doesn't work on WikiPedia's swagger spec

Description

Code generation for Go language fails when I use swaggerapi/swagger-codegen-cli Docker image for WikiPedia's updates stream. I have following error message:

[main] INFO io.swagger.parser.Swagger20Parser - reading from https://stream.wikimedia.org/?spec
[main] INFO io.swagger.parser.Swagger20Parser - reading from https://stream.wikimedia.org/?spec
[main] WARN io.swagger.codegen.ignore.CodegenIgnoreProcessor - Output directory does not exist, or is inaccessible. No file (.swagger-codegen-ignore) will be evaluated.
Exception in thread "main" java.lang.RuntimeException: missing swagger input or config!
        at io.swagger.codegen.DefaultGenerator.generate(DefaultGenerator.java:735)
        at io.swagger.codegen.cmd.Generate.run(Generate.java:285)
        at io.swagger.codegen.SwaggerCodegen.main(SwaggerCodegen.java:35)

Codegeneration for Pet Store example works ok for Go language.

Swagger-codegen version

2.4.0-SNAPSHOT

Swagger declaration file content or url

https://stream.wikimedia.org/?spec

Command line used for generation

docker run --rm -v ${PWD}:/local swaggerapi/swagger-codegen-cli generate -i https://stream.wikimedia.org/?spec -l go -o /local/out/go

Steps to reproduce

docker run --rm -v ${PWD}:/local swaggerapi/swagger-codegen-cli generate -i https://stream.wikimedia.org/?spec -l go -o /local/out/go

Start by running the Docker command against https://stream.wikimedia.org/?spec and compare it with the working Pet Store example. Read the reported path through DefaultGenerator.java and Generate.run; done means Go code generation completes for the Wikimedia URL without the missing swagger input or config error.