requesting user's mugshot via api OOPS when user is using the default one

Trying to get the mugshot of an user who is using the default one results in a 404 error and raises an OOPS. This should either return None or the default one.

In [1]: ajmitch = launchpad.people["ajmitch"]
send: 'GET /beta/~ajmitch HTTP/1.1\r\nHost: api.edge.launchpad.net:443\r\nAccept-Encoding: identity\r\nAuthorization: OAuth realm="https://api.launchpad.net", oauth_nonce="13892994", oauth_timestamp="1236031826", oauth_consumer_key="just testing", oauth_signature_method="PLAINTEXT", oauth_version="1.0", oauth_token="XXXXX", oauth_signature="&YYYYY"\r\nif-none-match: "231c4eae421edb15d9ab0b6828256410bcfc3604"\r\nte: deflate, gzip\r\naccept: application/json\r\nuser-agent: Python-httplib2/$Rev: 259 $\r\n\r\n'
reply: 'HTTP/1.1 304 Not Modified\r\n'
header: Date: Mon, 02 Mar 2009 22:10:27 GMT
header: Server: zope.server.http (HTTP)
header: Etag: "231c4eae421edb15d9ab0b6828256410bcfc3604"
header: Vary: Cookie,Authorization,Accept

In [2]: ajmitch.mugshot.open()
send: 'GET /beta/~ajmitch/mugshot HTTP/1.1\r\nHost: api.edge.launchpad.net:443\r\nAccept-Encoding: identity\r\nte: deflate, gzip\r\nAuthorization: OAuth realm="https://api.launchpad.net", oauth_nonce="41296980", oauth_timestamp="1236031831", oauth_consumer_key="just testing", oauth_signature_method="PLAINTEXT", oauth_version="1.0", oauth_token="XXXXX", oauth_signature="&YYYYY"\r\naccept: application/json\r\nuser-agent: Python-httplib2/$Rev: 259 $\r\n\r\n'
reply: 'HTTP/1.1 404 Not Found\r\n'
header: Date: Mon, 02 Mar 2009 22:10:31 GMT
header: Server: zope.server.http (HTTP)
header: X-Powered-By: Zope (www.zope.org), Python (www.python.org)
header: X-Lazr-Oopsid: OOPS-1157ED150
header: Content-Type: text/plain
header: Content-Length: 108
header: Via: 1.1 wildcard.edge.launchpad.net
send: 'GET /beta/~ajmitch/mugshot HTTP/1.1\r\nHost: api.edge.launchpad.net:443\r\nAccept-Encoding: identity\r\nte: deflate, gzip\r\nAuthorization: OAuth realm="https://api.launchpad.net", oauth_nonce="61619593", oauth_timestamp="1236031831", oauth_consumer_key="just testing", oauth_signature_method="PLAINTEXT", oauth_version="1.0", oauth_token="XXXXX", oauth_signature="&YYYYY"\r\naccept: application/json\r\nuser-agent: Python-httplib2/$Rev: 259 $\r\n\r\n'
reply: 'HTTP/1.1 404 Not Found\r\n'
header: Date: Mon, 02 Mar 2009 22:10:32 GMT
header: Server: zope.server.http (HTTP)
header: X-Powered-By: Zope (www.zope.org), Python (www.python.org)
header: X-Lazr-Oopsid: OOPS-1157EB167
header: Content-Type: text/plain
header: Content-Length: 108
header: Via: 1.1 wildcard.edge.launchpad.net
---------------------------------------------------------------------------
HTTPError Traceback (most recent call last)

/home/markus/<ipython console> in <module>()

/media/disk-1/lp_api/launnchpadlib/trunk/launchpadlib/resource.pyc in open(self, mode, content_type, filename)
    730 """Open the file on the server for read or write access."""
    731 if mode in ('r', 'w'):
--> 732 return HostedFileBuffer(self, mode, content_type, filename)
    733 else:
    734 raise ValueError("Invalid mode. Supported modes are: r, w")

/media/disk-1/lp_api/launnchpadlib/trunk/launchpadlib/resource.pyc in __init__(self, hosted_file, mode, content_type, filename)
    755 "specify filename.")
    756 response, value = hosted_file._root._browser.get(
--> 757 self.url, return_response=True)
    758 content_type = response['content-type']
    759 last_modified = response['last-modified']

/media/disk-1/lp_api/launnchpadlib/trunk/launchpadlib/_browser.pyc in get(self, resource_or_uri, headers, return_response)
    220 method = resource_or_uri.get_method('get')
    221 url = method.build_request_url()
--> 222 response, content = self._request(url, extra_headers=headers)
    223 if return_response:
    224 return (response, content)

/media/disk-1/lp_api/launnchpadlib/trunk/launchpadlib/_browser.pyc in _request(self, url, data, method, media_type, extra_headers)
    210 # Turn non-2xx responses into exceptions.
    211 if response.status // 100 != 2:
--> 212 raise HTTPError(response, content)
    213 return response, content
    214

HTTPError: HTTP Error 404: Not Found
---------------------------------------------------------------------------
Response: {'content-length': '108',
 'content-type': 'text/plain',
 'date': 'Mon, 02 Mar 2009 22:10:32 GMT',
 'server': 'zope.server.http (HTTP)',
 'status': '404',
 'via': '1.1 wildcard.edge.launchpad.net',
 'x-lazr-oopsid': 'OOPS-1157EB167',
 'x-powered-by': 'Zope (www.zope.org), Python (www.python.org)'}
Content: "Object: <canonical.launchpad.rest.bytestorage.LibraryBackedByteStorage object at 0xb040dd0>, name: 'mugshot'"
---------------------------------------------------------------------------

In [3]: