[IMP] cookies: when retrieving session cookie, catch eventual parsing errors and...

In case of unparsable cookie (modified, corrupted,...), openerp would not load and crash with white screen until expiration.
With the fix goes back to login screen.

bzr revid: mat@openerp.com-20140327120826-2p6ebnojtmdl1wpm

diff --cc addons/web/static/src/js/coresetup.js
index 7d37dc2,85c3284..1d6acf1
--- 1/addons/web/static/src/js/coresetup.js
--- 2/addons/web/static/src/js/coresetup.js
+++ b/addons/web/static/src/js/coresetup.js
@@@ -125,7 -125,12 +125,12 @@@ instance.web.Session = instance.web.Jso
          for(var i=0; i<cookies.length; ++i) {
              var cookie = cookies[i].replace(/^\s*/, '');
              if(cookie.indexOf(nameEQ) === 0) {
-                 return JSON.parse(decodeURIComponent(cookie.substring(nameEQ.length)));
+                 try {
+                     return JSON.parse(decodeURIComponent(cookie.substring(nameEQ.length)));
+                 } catch (err) {
 -                    // delete malformed cookie
++                    // wrong cookie, delete it
+                     this.set_cookie(name, '', -1);
+                 }
              }
          }
          return null;