WL#3629 - Replication of Invocation and Invoked Features

This patch adds code to the binlog calls for replication of the
CREATE, DROP, and UPDATE event commands. An extra gate was added 
to ensure a query with length 0 is not binlogged. This corrects 
the problem of events_scheduling and rpl_events failing on some
build machines.

sql/events.cc

@@ -351,7 +351,7 @@ Events::create_event(THD *thd, Event_parse_data *parse_data, bool if_not_exists)
     else /* Binlog the create event. */
     {
       event_queue->create_event(thd, new_element);
-      if (mysql_bin_log.is_open())
+      if (mysql_bin_log.is_open() && (thd->query_length > 0))
       {
         thd->clear_error();
         thd->binlog_query(THD::MYSQL_QUERY_TYPE,
@@ -426,7 +426,7 @@ Events::update_event(THD *thd, Event_parse_data *parse_data, sp_name *rename_to)
     {
       event_queue->update_event(thd, parse_data->dbname, parse_data->name,
                                 new_element);
-      if (mysql_bin_log.is_open())
+      if (mysql_bin_log.is_open() && (thd->query_length > 0))
       {
         thd->clear_error();
         thd->binlog_query(THD::MYSQL_QUERY_TYPE,
@@ -480,7 +480,7 @@ Events::drop_event(THD *thd, LEX_STRING dbname, LEX_STRING name, bool if_exists)
   {
     event_queue->drop_event(thd, dbname, name);
     /* Binlog the drop event. */
-    if (mysql_bin_log.is_open())
+    if (mysql_bin_log.is_open() && (thd->query_length > 0))
     {
       thd->clear_error();
       thd->binlog_query(THD::MYSQL_QUERY_TYPE,