Merge aelkin@bk-internal.mysql.com:/home/bk/mysql-5.0-rpl

into  koti.dsl.inet.fi:/home/elkin/MySQL/TEAM/FIXES/5.0/bug26000_show_slave_status_when_no_active_mi

sql/sql_parse.cc

@@ -2844,7 +2844,16 @@ mysql_execute_command(THD *thd)
     if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
       goto error;
     pthread_mutex_lock(&LOCK_active_mi);
-    res = show_master_info(thd,active_mi);
+    if (active_mi != NULL)
+    {
+      res = show_master_info(thd, active_mi);
+    }
+    else
+    {
+      push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 0,
+                   "the master info structure does not exist");
+      send_ok(thd);
+    }
     pthread_mutex_unlock(&LOCK_active_mi);
     break;
   }