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Hi, I'm getting an error "subject is not allowed to be nil" when calling /relation-tuples/check with POST
```// POST
<http://our.url.com/relation-tuples/check|our.url.com/relation-tuples/check>
{
    "namespace": "Application"
    ,"object": "helloworld"
    ,"relation": "use"
    ,"subject_id": "subjectFoo"
}```
```Response: {"error":{"code":400,"status":"Bad Request","request":"78bf4c3a-ab0d-90d6-9e16-ea07f9daea1a","message":"subject is not allowed to be nil"}}```
The same request is working against the same endpoint with GET

```// GET
<http://our.url.com/relation-tuples/check?namespace=Application&amp;object=helloworld&amp;relation=use&amp;subject_id=subjectFoo|our.url.com/relation-tuples/check?namespace=Application&amp;object=helloworld&amp;relation=use&amp;subject_id=subjectFoo>```
```Response: {"allowed":true}```
Any ideas?