traceback from iam instance profile load

[wt]

I have the following code

profile = iam.InstanceProfile(role_name)
provile.load()

where role_name is a instance_profile that does not exist.

I get the following traceback occasionally (but not always):

Traceback (most recent call last):
...
  File "/path/to/util.py", line 332, in iam_instance_profile_exists
    profile.load()
  File "/home/wt/.virtualenvs/sf/local/lib/python2.7/site-packages/boto3/resources/factory.py", line 483, in do_action
    response = action(self, *args, **kwargs)
  File "/home/wt/.virtualenvs/sf/local/lib/python2.7/site-packages/boto3/resources/action.py", line 83, in __call__
    response = getattr(parent.meta.client, operation_name)(**params)
  File "/home/wt/.virtualenvs/sf/local/lib/python2.7/site-packages/botocore/client.py", line 228, in _api_call
    return self._make_api_call(operation_name, kwargs)
  File "/home/wt/.virtualenvs/sf/local/lib/python2.7/site-packages/botocore/client.py", line 481, in _make_api_call
    operation_model, request_dict)
  File "/home/wt/.virtualenvs/sf/local/lib/python2.7/site-packages/botocore/endpoint.py", line 117, in make_request
    return self._send_request(request_dict, operation_model)
  File "/home/wt/.virtualenvs/sf/local/lib/python2.7/site-packages/botocore/endpoint.py", line 157, in _send_request
    request, operation_model, attempts)
  File "/home/wt/.virtualenvs/sf/local/lib/python2.7/site-packages/botocore/endpoint.py", line 203, in _get_response
    parser.parse(response_dict, operation_model.output_shape)),
  File "/home/wt/.virtualenvs/sf/local/lib/python2.7/site-packages/botocore/parsers.py", line 209, in parse
    parsed = self._do_error_parse(response, shape)
  File "/home/wt/.virtualenvs/sf/local/lib/python2.7/site-packages/botocore/parsers.py", line 433, in _do_error_parse
    root = self._parse_xml_string_to_dom(xml_contents)
  File "/home/wt/.virtualenvs/sf/local/lib/python2.7/site-packages/botocore/parsers.py", line 385, in _parse_xml_string_to_dom
    "invalid XML received:\n%s" % (e, xml_string))
botocore.parsers.ResponseParserError: Unable to parse response (no element found: line 1, column 0), invalid XML received:

However, I can immediately run the same script again and not get that exception. I expect to get something similar to the following exception:

...
botocore.exceptions.ClientError: An error occurred (NoSuchEntity) when calling the GetInstanceProfile operation: Instance Profile some-instance-profile cannot be found.

Do you have any idea what's going on or how I can work around it?