[BUGS] create unique index doesn't work properly

[Domingo Alvarez Duarte]

when executing the code bellow:

---
create table test_unique(i1 integer, i2 integer, unique(i1,i2));
insert into test_unique(1,null);
insert into test_unique(1,null);
insert into test_unique(1,null);
---

all "inserts" terminate sucefully, if there isn't "null" values it works
fine.

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