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 -->
prefix = 'MessageAttribute'
        names = []
        for (k, name) in [(k, data[k]) for k in data if k.startswith(prefix) and k.endswith('.Name')]:
            attr_name = name[0]
            k_id = k.split('.')[1]
            names.append((attr_name, k_id))
        msg_attrs = {}
        for (key_name, key_id) in names:
            msg_attrs[key_name] = {}
            
            attrs = [(k, data[k]) for k in data
                if k.startswith('{}.{}.'.format(prefix, key_id)) and not k.endswith('.Name')]
            for (attr_k, attr_v) in attrs:
                attr_name = attr_k.split('.')[3]
                msg_attrs[key_name][attr_name[0].lower() + attr_name[1:]] = attr_v[0]
            
            
            
            msg_attrs[key_name]['stringListValues'] = []
            msg_attrs[key_name]['binaryListValues'] = []
        return msg_attrs
    
    
    
    
    
    def _format_attributes(self, req_data):