Bug: Examples are not generated with OpenAPI 3.0 in nodejs server generation

Description

When OpenAPI 3.0 is used, the nodejs code generation (and as far as I can tell, other servers as well) does not generate example code. For example, you can see the difference in the examples here:

https://github.com/swagger-api/swagger-codegen/blob/v3.0.5/samples/server/petstore/nodejs/service/PetService.js
https://github.com/swagger-api/swagger-codegen/blob/master/samples/server/petstore/nodejs/service/PetService.js
In the second master version of the file, there's a examples[application/json] = that's missing from the 3.0.5 version. I've noticed this on all of my local code as well.

Swagger-codegen version

3.0.5 And I don't think it's a regression.

Swagger declaration file content or url

None attached

Command line used for generation

Steps to reproduce

Generating a nodejs server with the online tool, and the docker 3.0.5 cli tool (Only 2 I have tried).

Related issues/PRs

I haven't seen anything

Suggest a fix/enhancement

I've tried digging through the code but I'm at a loss. Even a pointing in the right direction would be helpful.

Compare samples/server/petstore/nodejs/service/PetService.js in the v3.0.5 and master versions, focusing on the missing examples[application/json] output. Reproduce generation with the online tool or Docker 3.0.5 CLI, then trace the server-generation templates or entry points responsible for examples and verify that generated Node.js services include them.