telepathy-butterfly crashed with AttributeError in findall()

This bug was originally reported by Maletherin on Launchpad (see URL).

"I was changing my alias for various IM accounts and each time I do so it crashes, it also crashes when adding a picture."

Traceback (most recent call last):
  File "/usr/lib/python2.5/site-packages/pymsn/service/SOAPService.py", line 198, in _response_handler
    handler(callback, errback, response, user_data)
  File "/usr/lib/python2.5/site-packages/pymsn/service/OfflineIM/rsi.py", line 45, in _HandleGetMetadataResponse
    callback[0](response.text, *callback[1:])
  File "/usr/lib/python2.5/site-packages/pymsn/service/OfflineIM/scenario/sync_headers.py", line 41, in __get_metadata_callback
    callback[0](metadata, *callback[1:])
  File "/usr/lib/python2.5/site-packages/pymsn/service/OfflineIM/offline_messages_box.py", line 251, in __parse_metadata
    for m in metadata.findall('./M'):
  File "/usr/lib/python2.5/site-packages/pymsn/util/element_tree.py", line 143, in findall
    return self.tree.findall(path)
AttributeError: 'NoneType' object has no attribute 'findall'

I'm not entirely sure whether this crash belongs to telepathy-butterfly or pymsn.
Using telepathy-butterfly / pymsn 0.3.1.

The crash seems relative to the Offline IM inbox and not with the described scenarios. Might only be a coincidence that the user did these actions while it was retrieving the offline message.

Anyway that bug has been fixed a long time ago.