[offlineimap] offlineimap doesn't fallback gracefully on XOAUTH2 (#258)

[Nicolas Sebrecht]

@Frizlab: It appears that when user doesn't want XOAUTH2, it doesn't fallback gracefully:

```
Account sync nis:
 ERROR: No remote oauth2_request_url for repository 'Remotenis' specified.
ERROR: Exceptions occurred during the run!
ERROR: No remote oauth2_request_url for repository 'Remotenis' specified.

Traceback:
  File "/home/nicolas/dev/official_packages/gitrepos/offlineimap/offlineimap/accounts.py", line 248, in syncrunner
    self.remoterepos = Repository(self, 'remote')
  File "/home/nicolas/dev/official_packages/gitrepos/offlineimap/offlineimap/repository/__init__.py", line 82, in __new__
    return repo(name, account)
  File "/home/nicolas/dev/official_packages/gitrepos/offlineimap/offlineimap/repository/IMAP.py", line 38, in __init__
    self.imapserver = imapserver.IMAPServer(self)
  File "/home/nicolas/dev/official_packages/gitrepos/offlineimap/offlineimap/imapserver.py", line 100, in __init__
    self.oauth2_request_url = repos.getoauth2_request_url()
  File "/home/nicolas/dev/official_packages/gitrepos/offlineimap/offlineimap/repository/IMAP.py", line 276, in getoauth2_request_url
    OfflineImapError.ERROR.REPO)
```

---
Reply to this email directly or view it on GitHub:
https://github.com/OfflineIMAP/offlineimap/issues/258
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