* Make endpoints which don't return anything yield NoContent
Relevant issue: OpenAPITools/openapi-generator#9901
The haskell-http-client generator tries to generate a polymorphic return
type for endpoints which don't return anything in the success case, but
still produce content in other cases. This means that these endpoints
hit a decoding error in the success case, because there is no content to
decode.
This changes the behaviour so that endpoints that don't return anything
are *always* generated as returning NoContent, and never try to decode
the response. This change is based on a similar one for the
haskell-servant generator, which can be found at:
OpenAPITools/openapi-generator#9830
which resolved a similar issue for that generator.
* Update samples after haskell-http-client NoContent change
