pdo was missing a global on db_begin/end_transaction()

include/db/pdo-postgres.inc.php

@@ -8,6 +8,7 @@
  * @access public
  */
 function serendipity_db_begin_transaction(){
+    global $serendipity;
     $serendipity['dbConn']->beginTransaction();
 }
 
@@ -18,6 +19,7 @@ function serendipity_db_begin_transaction(){
  * @param  boolean  If true, perform the query. If false, rollback.
  */
 function serendipity_db_end_transaction($commit){
+    global $serendipity;
     if ($commit){
         $serendipity['dbConn']->commit();
     }else{

include/db/pdo-sqlite.inc.php

@@ -49,6 +49,7 @@ function serendipity_db_sqlite_fetch_array($row, $type = PDO::FETCH_ASSOC)
  */
 
 function serendipity_db_begin_transaction(){
+    global $serendipity;
     $serendipity['dbConn']->beginTransaction();
 }
 
@@ -59,6 +60,7 @@ function serendipity_db_begin_transaction(){
  * @param  boolean  If true, perform the query. If false, rollback.
  */
 function serendipity_db_end_transaction($commit){
+    global $serendipity;
     if ($commit){
         $serendipity['dbConn']->commit();
     }else{