Traceback on journal['last_comment_meta'] in backup.py

[zetasyanthis]

This is from the 0.2 release. Looks like the journal['last_comment_meta'] field occasionally comes back None, which blows up backup.py.

Traceback (most recent call last):
  File "./src/myarchive/main.py", line 156, in <module>
    main()
  File "./src/myarchive/main.py", line 146, in main
    ljapi.download_journals_and_comments()
  File "/mnt/bulk/repos/projects/myarchive/src/myarchive/ljlib.py", line 39, in download_journals_and_comments
    nc = update_journal_comments(server=self._server, journal=self.journal)
  File "/usr/local/lib/python2.7/dist-packages/lj/backup.py", line 148, in update_journal_comments
    if len(journal['comments']) == 0 or days_ago(journal['last_comment_meta']) > 30:
  File "/usr/local/lib/python2.7/dist-packages/lj/backup.py", line 61, in days_ago
    return (datetime.datetime.today() - datetime_from_string(s)).days
  File "/usr/local/lib/python2.7/dist-packages/lj/backup.py", line 57, in datetime_from_string
    return datetime.datetime.strptime(s, "%Y-%m-%d %H:%M:%S")
TypeError: must be string, not None

[zetasyanthis]

I'm guessing that if statement needs have this additional condition added?

Original:
if len(journal['comments']) == 0 or days_ago(journal['last_comment_meta']) > 30:

New:
if journal['last_comment_meta'] is None or len(journal['comments']) == 0 or days_ago(journal['last_comment_meta']) > 30: