Dropping schema does not remove table file when using blackhole

Dropping schema does not remove table file when using blackhole, this currently prevents drizzleslap from running with blackhole

drizzle> create schema foo;
Query OK, 1 row affected (0.01 sec)

drizzle> use foo;
Database changed

drizzle> create table foo (a int) engine=blackhole;
Query OK, 0 rows affected (0 sec)

drizzle> drop schema foo;
ERROR 1010 (HY000): Error dropping database (can't rmdir './foo/', errno: 39)

Dropping the table specifically does work ->

drizzle> use foo;

drizzle> drop table foo;
Query OK, 0 rows affected (0 sec)

drizzle> drop schema foo;
Query OK, 0 rows affected (0 sec)