7.3 - ModtrackerHandler no longer records User ID when records are created/updated via Webservice

in /modules/ModTracker/ModtrackerHandler.php in handleEvent() function the variable $_SESSION["authenticated_user_id"] is NULL if the record is created or updated via the Webservice. This means the 'whodid' value is recorded as NULL and when viewing a record created or updated via WebService and viewing the recent updates, it does not show the updates correctly, due to not having a correct User.