**Problem**
For *non-existent* Kinesis streams:
* the command `awslocal kinesis describe-stream` returns a ResourceNotFoundException (as expected) 
* whereas `describe-stream-summary` returns stream details (as if it existed).

**Expected behaviour**
It's expected that both commands return a ResourceNotFoundException for non-existent streams. It has been verified that this is the case with AWS CLI with real AWS.

**Reproduction**
```
✗ docker run -d -e SERVICES=s3,iam,kinesis localstack/localstack:0.10.2
513dcffc9a7e8f7b4c12b20972119c5fd797f269ae4cbfe62d8bc9f66a6116eb

✗ docker container ls | head -n2
CONTAINER ID        IMAGE                          COMMAND                  CREATED             STATUS              PORTS                     NAMES
513dcffc9a7e        localstack/localstack:0.10.2   "docker-entrypoint.sh"   44 seconds ago      Up 42 seconds       4567-4597/tcp, 8080/tcp   nostalgic_mcclintock

✗ docker exec -it nostalgic_mcclintock sh
/opt/code/localstack # awslocal kinesis describe-stream --stream-name idontexist
An error occurred (ResourceNotFoundException) when calling the DescribeStream operation: Stream idontexist under account 000000000000 not found.

/opt/code/localstack # awslocal kinesis describe-stream-summary --stream-name idontexist
{
    "StreamDescriptionSummary": {
        "StreamName": "idontexist",
        "StreamARN": "idontexist",
        (...)
        "OpenShardCount": 0,
        "ConsumerCount": 0
    }
}
/opt/code/localstack # awslocal kinesis list-streams
{
    "StreamNames": []
}
/opt/code/localstack # 
```
response = Response()
            response.status_code = 200
            content = {
                'CurrentShardCount': 1,
                'StreamName': data['StreamName'],
                'TargetShardCount': data['TargetShardCount']
            }
            response.encoding = 'UTF-8'
            response._content = json.dumps(content)
            return response
UPDATE_KINESIS = ProxyListenerKinesis()
def kinesis_error_response(data, action):
    error_response = Response()
    if action == ACTION_PUT_RECORD:
        error_response.status_code = 400
        content = {
            'ErrorCode': 'ProvisionedThroughputExceededException',
            'ErrorMessage': 'Rate exceeded for shard X in stream Y under account Z.'
        }
    else:
        error_response.status_code = 200
        content = {'FailedRecordCount': 1, 'Records': []}
        for record in data.get('Records', []):
            content['Records'].append({
                'ErrorCode': 'ProvisionedThroughputExceededException',
                'ErrorMessage': 'Rate exceeded for shard X in stream Y under account Z.'
            })
    error_response._content = json.dumps(content)
    return error_response