Corona: Change return type for raw data
In a attempt to test a new POST api I forgot to send a body and got this response:
{
    "data": {},
    "status": {
        "code": 500,
        "message": "Return value of Lunr\\Corona\\Request::get_raw_data() must be of the type string, null returned"
    }
}


The probablity that this happens in with real requests is low but I still think this must be handled better

unit tests