[DefaultCodegen] Possible missing model for request body for OAS 3.0

Created by: Articus

Description

Consider the following spec:

openapi: 3.0.0
info:
  title: Test
  version: 1.0.0
servers:
  - url: 'http://test/'
components:
  requestBodies:
    TestBodyInline:
      content:
        application/json:
          schema:
            type: object
            properties:
              test:
                type: string
paths:
  /test/ref/inline:
    post:
      summary: Test
      requestBody:
        $ref: '#/components/requestBodies/TestBodyInline'
      responses:
        '200':
          description: Success
          content:
            application/json:
              schema:
                type: string

For this spec CodegenOperation::bodyParam.dataType equals to "object" and no codegen model is generated for request body. A bit lost why this is happenning because 3 other possible scenarios (inline body + inline schema, inline body + ref schema, ref body + ref schema) work perfectly well.