pressflow/6 — pull request #86 by balrajb (2014-04-22 08:23:19+00:00)
Title: Fix empty session id.

There is a bug in core Drupal, which has been fixed in Drupal 7, need same fix in 6 "The session is created with an empty string sid".
Here is a possible fix, should use !empty(), rather than isset(), to ensure that blank session IDs are not valid.