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).

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queue_url = req_data['QueueUrl'][0]
        attrs = self._format_attributes(req_data)
        
        attrs = dict([(k, v) for k, v in attrs.items() if k in UNSUPPORTED_ATTRIBUTE_NAMES])
        QUEUE_ATTRIBUTES[queue_url] = QUEUE_ATTRIBUTES.get(queue_url) or {}
        QUEUE_ATTRIBUTES[queue_url].update(attrs)
    def _add_queue_attributes(self, req_data, content_str):
        flags = re.MULTILINE | re.DOTALL
        queue_url = req_data['QueueUrl'][0]
        regex = r'(.*<GetQueueAttributesResult>)(.*)(</GetQueueAttributesResult>.*)'
        attrs = re.sub(regex, r'\2', content_str, flags=flags)
        for key, value in QUEUE_ATTRIBUTES.get(queue_url, {}).items():
            if not re.match(r'<Name>\s*%s\s*</Name>' % key, attrs, flags=flags):
                attrs += '<Attribute><Name>%s</Name><Value>%s</Value></Attribute>' % (key, value)
        content_str = (re.sub(regex, r'\1', content_str, flags=flags) +
            attrs + re.sub(regex, r'\3', content_str, flags=flags))
        return content_str
    def _fire_event(self, req_data, response):