[FIX] link_tracker: fix link tracer when no geoip in session

The `geoip` is not always defined in the session,
and therefore one needs to check it's defined before
attempting to use it.

The same is done at different places in the code,
through the different modules.

opw-687783

addons/link_tracker/controller/main.py

@@ -8,6 +8,7 @@ from openerp.http import request
 class link_tracker(http.Controller):
     @http.route('/r/<string:code>', type='http', auth='none', website=True)
     def full_url_redirect(self, code, **post):
-        request.env['link.tracker.click'].add_click(code, request.httprequest.remote_addr, request.session['geoip'].get('country_code'), stat_id=False)
+        country_code = request.session.geoip and request.session.geoip.get('country_code') or False
+        request.env['link.tracker.click'].add_click(code, request.httprequest.remote_addr, country_code, stat_id=False)
         redirect_url = request.env['link.tracker'].get_url_from_code(code)
         return werkzeug.utils.redirect(redirect_url or '', 301)