We're running Docker on Windows 10. We have a simple java springboot application, which should interact with aws kinesis and s3. For local testing, we want to pull the localstack docker latest image and install and run. But the startup for Kinesis throws error whereas S3 works fine. Below are the details:

```
docker compose:
version: '3.1'
services:
  localstack:
    image: "localstack/localstack"
    container_name: localstack_demo
    environment:
      SERVICES: kinesis, s3, sqs
      DEBUG: 1
      DATA_DIR: /tmp/localstack
      KINESIS_STREAM_SHARDS: 1
      KINESIS_ERROR_PROBABILITY: 0.0
      KINESIS_STREAM_NAME: my-stream
    ports:
      - "4567-4584:4567-4584"
      - "8055:8080"
    volumes:
      - './.localstack:/tmp/localstack'
      - '/var/run/docker.sock:/var/run/docker.sock'
```

When we try to hit the default url fot Kinesis, http://localhost:4568, we get the following error: (please note that default url for S3 responds as expected):

```
localstack_demo | 2019-09-24T22:35:27:ERROR:localstack.services.generic_proxy: Error forwarding request: the JSON object must be str, bytes or bytearray, not 'NoneType' Traceback (most recent call last):
localstack_demo |   File "/opt/code/localstack/localstack/services/generic_proxy.py", line 240, in forward
localstack_demo |     path=path, data=data, headers=forward_headers)
localstack_demo |   File "/opt/code/localstack/localstack/services/kinesis/kinesis_listener.py", line 22, in forward_request
localstack_demo |     data = json.loads(to_str(data))
localstack_demo |   File "/usr/lib/python3.6/json/__init__.py", line 348, in loads
localstack_demo |     'not {!r}'.format(s.__class__.__name__))
localstack_demo | TypeError: the JSON object must be str, bytes or bytearray, not 'NoneType'
```
import json
import random
from requests.models import Response
from localstack import config
from localstack.utils.common import to_str
from localstack.utils.analytics import event_publisher
from localstack.services.awslambda import lambda_api
from localstack.services.generic_proxy import ProxyListener
ACTION_PREFIX = 'Kinesis_20131202'
ACTION_PUT_RECORD = '%s.PutRecord' % ACTION_PREFIX
ACTION_PUT_RECORDS = '%s.PutRecords' % ACTION_PREFIX
ACTION_LIST_STREAMS = '%s.ListStreams' % ACTION_PREFIX
ACTION_CREATE_STREAM = '%s.CreateStream' % ACTION_PREFIX
ACTION_DELETE_STREAM = '%s.DeleteStream' % ACTION_PREFIX
ACTION_UPDATE_SHARD_COUNT = '%s.UpdateShardCount' % ACTION_PREFIX
class ProxyListenerKinesis(ProxyListener):
    def forward_request(self, method, path, data, headers):