* Adds issue spec file and attemts to generate code from it
* Adds missing schema definitions
* Skips fromProperty invocation if the passed in schema is none in getContent
* Makes MediaType.schema optional
* Adds checking that the content type is in self.content
* Sets ApiResponse body type as Unset if there is no schema for it
* Handles schema = None case
* Adds endpoint without response schema
* Reverts version files
* Adds test_response_without_schema
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