[BUG] Change in addToHttpParams function lead to json encoding error - Regression 7.12

[bhahn57570]

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• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
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• What's the actual output vs expected output?
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Description

There is a change in the post httparams behaviour in the typescript services with the base Service new implementation

openapi-generator version

7.11 was fine 7.12 add a regression

Bug

The function addToHttpParams in 7.11 version

// @ts-ignore
private addToHttpParams(httpParams: HttpParams, value: any, key?: string): HttpParams {
if (typeof value === "object" && value instanceof Date === false) {
httpParams = this.addToHttpParamsRecursive(httpParams, value);
} else {
httpParams = this.addToHttpParamsRecursive(httpParams, value, key);
}
return httpParams;
}

With this implementation the output was http://localhost:8090/api/persons?name=dd for a simple object containing a variable name

Now the new implementation

protected addToHttpParams(httpParams: HttpParams, value: any, key?: string): HttpParams {
// If the value is an object (but not a Date), recursively add its keys.
if (typeof value === 'object' && !(value instanceof Date)) {
return this.addToHttpParamsRecursive(httpParams, value, key);
}
return this.addToHttpParamsRecursive(httpParams, value, key);
}

Is producing the output http://localhost:8090/api/persons?criteria=%7B%22name%22%3A%22eee%22%7D.
The else is missing, then a json is used as a query parameter and then enconded.