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```

records = []
        i = 0
        for table_name in sorted(data['RequestItems'].keys()):
            for request in data['RequestItems'][table_name]:
                put_request = request.get('PutRequest')
                if put_request:
                    existing_item = self._thread_local('existing_items')[i]
                    keys = dynamodb_extract_keys(item=put_request['Item'], table_name=table_name)
                    if isinstance(keys, Response):
                        return keys
                    new_record = clone(record)
                    new_record['eventName'] = 'INSERT' if not existing_item else 'MODIFY'
                    new_record['dynamodb']['Keys'] = keys
                    new_record['dynamodb']['NewImage'] = put_request['Item']
                    if existing_item:
                        new_record['dynamodb']['OldImage'] = existing_item
                    new_record['eventSourceARN'] = aws_stack.dynamodb_table_arn(table_name)
                    records.append(new_record)
                delete_request = request.get('DeleteRequest')
                if delete_request:
                    keys = delete_request['Key']
                    if isinstance(keys, Response):
                        return keys
                    new_record = clone(record)
                    new_record['eventName'] = 'REMOVE'