[Content-Search-API] Error code 500 when no parameter on searching

Description

Steps to reproduce:

1. Senda request via Postman, for example:

{{EPCMSHost}}/api/episerver/v1.0/search/content

Expected:
It returns all content that matches the criteria

Actual:
Error 500 External error:

{
    "error": {
        "code": "InternalServerError",
        "message": "Unable to retrieve search response"
    }
}

If input personalize = false (by default personalize = false), all content is returned normally.