[FIX] mass_mailing: don't assume the request will have a geoip

geoip is set by the website module. If website is not installed,
request.session.geoip won't exist. Because all the geoip logic is in the
website module this means that if you don't install the website module
all of your tracked links will have an undefined country. This isn't
that big of an issue, because as far as I can tell the only default view
that displays this country is in website_links.

Ideally, the geoip should perhaps be moved to base, but for now this
will do.

addons/mass_mailing/controllers/main.py

@@ -22,5 +22,10 @@ class MassMailController(http.Controller):
     @http.route('/r/<string:code>/m/<int:stat_id>', type='http', auth="none")
     def full_url_redirect(self, code, stat_id, **post):
         cr, uid, context = request.cr, request.uid, request.context
-        request.registry['link.tracker.click'].add_click(cr, uid, code, request.httprequest.remote_addr, request.session['geoip'].get('country_code'), stat_id=stat_id, context=context)
+
+        # don't assume geoip is set, it is part of the website module
+        # which mass_mailing doesn't depend on
+        country_code = request.session.get('geoip', False) and request.session.geoip.get('country_code', False)
+
+        request.registry['link.tracker.click'].add_click(cr, uid, code, request.httprequest.remote_addr, country_code, stat_id=stat_id, context=context)
         return werkzeug.utils.redirect(request.registry['link.tracker'].get_url_from_code(cr, uid, code, context=context), 301)