Started with `localstack start` then navigated to `http://localhost:4569/shell`

Localstack version is `0.10.5`

![Screenshot from 2019-11-26 08-15-03](https://user-images.githubusercontent.com/57932946/69588919-24798700-1025-11ea-94d2-9cfb6dd20004.png)

Console log below, its all the same so I am just posting one

```2019-11-26T00:13:18:ERROR:localstack.services.generic_proxy: Error forwarding request: the JSON object must be str, bytes or bytearray, not NoneType Traceback (most recent call last):
  File "/opt/code/localstack/localstack/services/generic_proxy.py", line 240, in forward
    path=path, data=data, headers=forward_headers)
  File "/opt/code/localstack/localstack/services/dynamodb/dynamodb_listener.py", line 44, in forward_request
    data = json.loads(to_str(data))
  File "/usr/lib/python3.7/json/__init__.py", line 341, in loads
    raise TypeError(f'the JSON object must be str, bytes or bytearray, '
TypeError: the JSON object must be str, bytes or bytearray, not NoneType```

response = error_response(message='Cannot do operations on a non-existent table',
                              error_type='ResourceNotFoundException')
    fix_headers_for_updated_response(response)
    return response
def fix_headers_for_updated_response(response):
    response.headers['content-length'] = len(to_bytes(response.content))
    response.headers['x-amz-crc32'] = calculate_crc32(response)
def calculate_crc32(response):
    return crc32(to_bytes(response.content)) & 0xffffffff
def create_dynamodb_stream(data, latest_stream_label):