PG class updates, basic class updates

In basic class, do SET_SESSION_NAME check with isset to avoid notice log
entries.

Change log/error return for execute data error

base postgresql calss calls set the last run query on error if no result
is returned for prepare and execute

www/libs/Class.Basic.inc

@@ -312,7 +312,7 @@
 			if (!session_id())
 			{
 				// check if we have an external session name given, else skip this step
-				if (SET_SESSION_NAME)
+				if (isset(SET_SESSION_NAME))
 				{
 					// set the session name for possible later check
 					$this->session_name = SET_SESSION_NAME;