Server audit: Empty password in CHANGE MASTER is not obfuscated

MariaDB [test]> stop slave;

Query OK, 0 rows affected (0.13 sec)

MariaDB [test]> change master to master_password='a';

Query OK, 0 rows affected (0.35 sec)

MariaDB [test]> change master to master_password='';

Query OK, 0 rows affected (0.38 sec)

20150114 16:30:42,wheezy-64,root,localhost,2,30,QUERY,test,'stop slave',0

20150114 16:30:43,wheezy-64,root,localhost,2,31,QUERY,test,'change master to master_password=*****',0

20150114 16:30:46,wheezy-64,root,localhost,2,32,QUERY,test,'change master to master_password=\'\'',0