StandardError raised if no response content type found for deserialization

Some requests for example `https://graph.microsoft.com/v1.0/identityProtection/riskyUsers/confirmCompromised` may return a status 204 reason No Content and an empty response body. 
```
@status=204 @reason_phrase="No Content" @response_body=""
```

This should not be treated as a fatal error and the `send_async(request_info, factory, errors_mapping)` method should just return an empty body
