**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 # 
```
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_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):