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```

if not message:
        message = 'Unknown error'
    if not error_type:
        error_type = 'UnknownError'
    if 'com.amazonaws.dynamodb' not in error_type:
        error_type = 'com.amazonaws.dynamodb.v20120810#%s' % error_type
    response = Response()
    response.status_code = code
    content = {
        'message': message,
        '__type': error_type
    }
    response._content = json.dumps(content)
    return response
def error_response_throughput():
    message = ('The level of configured provisioned throughput for the table was exceeded. ' +
            'Consider increasing your provisioning level with the UpdateTable API')
    error_type = 'ProvisionedThroughputExceededException'
    return error_response(message, error_type)