[pyramid] Recreate CWSession entity when eid no longer exists As noted in comment, it might occur that we receive a "sessioneid" from a valid cookie while respective CWSession got dropped (typical case is db being recreated while users got preserved). In such case, we just recreate the CWSession entity as if it did not exist.

cubicweb source: source-is-missing cubicweb/web/data/jquery.flot.js line length is * characters (>512)