Small fix for post-login redirect

[danfairs]

Don't break if there's no redirect URL in the callback, but there is a session with no redirect_url in it.

This happens if you've got sessions configured, and you link to the facebook_login view without providing a ?next= querystring parameter.

[bjornlilja]

We have the same problem, this fix would be great.

Traceback (most recent call last):

File "/usr/local/lib/python2.6/dist-packages/django/core/handlers/base.py", line 117, in get_response
response = middleware_method(request, e)

File "/usr/local/lib/python2.6/dist-packages/django/core/handlers/base.py", line 111, in get_response
response = callback(request, _callback_args, *_callback_kwargs)

File "/usr/local/lib/python2.6/dist-packages/la_facebook/views.py", line 54, in facebook_callback
return access.callback(request, access, auth_token)

File "/usr/local/lib/python2.6/dist-packages/la_facebook/callbacks/base.py", line 46, in call
redirect_to = self.redirect_url(request)

File "/usr/local/lib/python2.6/dist-packages/la_facebook/callbacks/base.py", line 76, in redirect_url
netloc = urlparse.urlparse(redirect_to)[1]

File "/usr/lib/python2.6/urlparse.py", line 129, in urlparse
tuple = urlsplit(url, scheme, allow_fragments)

File "/usr/lib/python2.6/urlparse.py", line 168, in urlsplit
i = url.find(':')

AttributeError: 'NoneType' object has no attribute 'find'

[mmansour]

I had the same problem and applied this fix.
Thanks!

[EmilStenstrom]

Please apply this pull request. We've run it in production for august, with no issues. It's a little annoying to have to reference a personal git account instead of an official release.

1. Apply this request
2. Make a fresh release on PyPi