fix: Fix no required body in types

[Denwa799]

There was an error where it was impossible to pass an object to the request body if it was not required by the schema. Error where you can't assign anything to undefined

requestBody?: {
            content: {
                "application/json": components["schemas"]["Pet"];
                "application/xml": components["schemas"]["Pet"];
                "application/x-www-form-urlencoded": components["schemas"]["Pet"];
            };
        };

post:
      tags:
        - pet
      summary: Add a new pet to the store
      description: Add a new pet to the store
      operationId: addPet
      requestBody:
        description: Create a new pet in the store
        content:
          application/json:
            schema:
              $ref: "#/components/schemas/Pet"
          application/xml:
            schema:
              $ref: "#/components/schemas/Pet"
          application/x-www-form-urlencoded:
            schema:
              $ref: "#/components/schemas/Pet"
        required: false