Regarding optional requestParams getting added to Body section during code generation

Version of openapigenerator : v4.3.0
Issue description: In my openapi file if the entry of requestparams is like this
/v1/request-type/list:
post:
tags:
- request-type
summary: Testing
description: Testing
operationId: addRequestTypeList
requestBody:
content:
'/':
schema:
type: array
items:
$ref: '#/components/schemas/RequestType'

so the corresponding code that is getting gererated is like below
export interface AddRequestTypeListRequest {
requestType?: Array;
}
const response = await this.request({
path: /v1/request-type/list,
method: 'POST',
headers: headerParameters,
query: queryParameters,
body: requestParameters.requestType.map(RequestTypeToJSON),
});
which gives error during compile time as
(property) AddRequestTypeListRequest.requestType?: RequestType[] | undefined
Object is possibly 'undefined'.

Ideally the body content should be created like this optional to resolve the above error
body: requestParameters.requestType.?map(RequestTypeToJSON),

Also checked the github code for the same. Can we add this provision or is there any other way

https://github.com/OpenAPITools/openapi-generator/blob/v4.3.0/modules/openapi-generator/src/main/resources/typescript-fetch/apis.mustache
line no 255
line no 21

Can you help me to resolve this issue

Start in modules/openapi-generator/src/main/resources/typescript-fetch/apis.mustache at the referenced lines and inspect how optional request parameters are emitted into generated request bodies. Reproduce the v4.3.0 TypeScript fetch output from the issue and verify that the generated code compiles without an undefined optional-parameter error.