We are having an issue with the latest image of localstack (bc991b0bc3ce).
While creating an SQS and setting parameters we experience the following error:

```
localstack_1        | 2019-09-09T10:46:22:ERROR:localstack.services.generic_proxy: Error forwarding request: 'QueueUrl' Traceback (most recent call last):
localstack_1        |   File "/opt/code/localstack/localstack/services/generic_proxy.py", line 234, in forward
localstack_1        |     path=path, data=data, headers=forward_headers)
localstack_1        |   File "/opt/code/localstack/localstack/services/sqs/sqs_listener.py", line 53, in forward_request
localstack_1        |     self._set_queue_attributes(req_data)
localstack_1        |   File "/opt/code/localstack/localstack/services/sqs/sqs_listener.py", line 245, in _set_queue_attributes
localstack_1        |     queue_url = req_data['QueueUrl'][0]
localstack_1        | KeyError: 'QueueUrl'
```

From the logs I guess the `QueueUrl` is expected and it's not there. We don't see this behaviour in the last version (0.10.2).

<!-- Love localstack? Please consider supporting our collective:
👉  https://opencollective.com/localstack/donate -->
</ResponseMetadata>
    </SendMessageResponse>
""".strip() % XMLNS_SQS
VALID_ATTRIBUTE_NAMES = ['DelaySeconds', 'MaximumMessageSize', 'MessageRetentionPeriod',
    'Policy', 'ReceiveMessageWaitTimeSeconds', 'RedrivePolicy', 'VisibilityTimeout']
UNSUPPORTED_ATTRIBUTE_NAMES = ['MaximumMessageSize', 'MessageRetentionPeriod', 'Policy', 'RedrivePolicy']
QUEUE_ATTRIBUTES = {}
class ProxyListenerSQS(ProxyListener):
    def forward_request(self, method, path, data, headers):
        if method == 'OPTIONS':
            return 200
        req_data = self.parse_request_data(method, path, data)
        if req_data:
            action = req_data.get('Action', [None])[0]
            if action == 'SendMessage':
                new_response = self._send_message(path, data, req_data, headers)
                if new_response:
                    return new_response
            elif action == 'SetQueueAttributes':
                self._set_queue_attributes(req_data)
            if 'QueueName' in req_data:
                encoded_data = urlencode(req_data, doseq=True) if method == 'POST' else ''
                modified_url = None
                if method == 'GET':
                    base_path = path.partition('?')[0]
                    modified_url = '%s?%s' % (base_path, urlencode(req_data, doseq=True))
                request = Request(data=encoded_data, url=modified_url, headers=headers, method=method)
                return request
        return True
    def parse_request_data(self, method, path, data):