multi_zdel is not removing everything

[dim]

When using multi_zdel it seems that not everything is correctly removed. Although the keys are gone, the sets themselves still remain. See example below:

> zset n a 1
  ok
  (0.003 sec)
> zset n b 2
  ok
  (0.000 sec)
> zsize n
  2
  (0.000 sec)
> zscan n a 0 100 -1
  key             score
  -------------------------
    a              : 1
    b              : 2
  2 result(s) (0.000 sec)
> multi_zdel n a b
  2
  (0.000 sec)
> zscan n a 0 100 -1        # <----- OK
  key             score
  -------------------------
  0 result(s) (0.000 sec)
> zsize n                   # <----- NOT OK, should return 0
  1
  (0.000 sec)
> zlist k m -1              # <----- NOT OK, should return no results
               name
  -----------------
                  n
  1 result(s) (0.000 sec)

[ideawu]

fixed since 1.4.2