Using the :latest localstack, attempts to delete an SQS queue fail with the following error logged to the console.

```localstack_1                          | 2020-02-11T19:04:08:ERROR:localstack.services.generic_proxy: Error forwarding request: 'Attribute.1.Value' Traceback (most recent call last):
localstack_1                          |   File "/opt/code/localstack/localstack/services/generic_proxy.py", line 248, in forward
localstack_1                          |     path=path, data=data, headers=forward_headers)
localstack_1                          |   File "/opt/code/localstack/.venv/lib/python3.7/site-packages/localstack_ext/services/sqs/sqs_extended.py", line 30, in forward_request
localstack_1                          |   File "/opt/code/localstack/localstack/services/sqs/sqs_listener.py", line 60, in forward_request
localstack_1                          |     self._set_queue_attributes(queue_url, req_data)
localstack_1                          |   File "/opt/code/localstack/.venv/lib/python3.7/site-packages/localstack_ext/services/sqs/sqs_extended.py", line 73, in _set_queue_attributes
localstack_1                          |   File "/opt/code/localstack/localstack/services/sqs/sqs_listener.py", line 275, in _set_queue_attributes
localstack_1                          |     attrs = self._format_attributes(req_data)
localstack_1                          |   File "/opt/code/localstack/localstack/services/sqs/sqs_listener.py", line 237, in _format_attributes
localstack_1                          |     key_value = req_data[key2][0]
localstack_1                          | KeyError: 'Attribute.1.Value'```

I'm using terraform to manage my SQS queues and the deletion was triggered by renaming the queue.
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
    @classmethod
    def get_message_attributes_md5(self, req_data):