[v6] include optional parameters with no media type in mediatype-specific options bag #626
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@bterlson found an issue where optional parameters were being ignored when an operation supports multiple media types.
It turns out our code that generated the mediatype-specific options bags checked if a parameter's mediatype matched the overload's mediatype. This meant we were excluding optional parameters that applied to all overloads.
I added an Open API V3 model to generate a client that exercises these conditions. I'm not sure if it's possible to encounter this with an Open API V2 (swagger) file given how you specify multiple content-types there.