Crash when finding "me" emails

[signal15]

This was run against an MS Exchange account. MAILBOX_GMAIL... variables were both changed to "INBOX". Here's the error:

[2015-10-14 17:36:48,550] Identifying "me" messages
Traceback (most recent call last):
File "./main.py", line 251, in
message_infos = GetMessageInfos(opts)
File "./main.py", line 94, in GetMessageInfos
name, address = message_info.GetSender()
File "/Users/xxx/mail-trends/messageinfo.py", line 67, in GetSender
return self._GetNameAddress("from")
File "/Users/xxx/mail-trends/messageinfo.py", line 94, in _GetNameAddress
if not header in self.headers:
AttributeError: 'MessageInfo' object has no attribute 'headers'

[signal15]

I have a fix. It works, but no idea if it's just covering up a larger problem. Add to line 94 of messageinfo.py before "if not header in self.headers:"

if not hasattr(self, 'headers'):
return None, None