Sparsify console output issue
Should not have that AAA hole

```
In [31]: result
Out[31]: 
                            sp1  sp2  sp3
method replicate site year               
EDGE   1         AAA  2006    2    4    6
                 BBB  2006    2    4    6
       2         AAA  2006    2    4    6
RIFFLE 1              2006    2    4    6
                 BBB  2006    2    4    6
       2         AAA  2006    2    4    6

In [32]: result.index
Out[32]: 
MultiIndex
[('EDGE', 1, 'AAA', 2006) ('EDGE', 1, 'BBB', 2006)
 ('EDGE', 2, 'AAA', 2006) ('RIFFLE', 1, 'AAA', 2006)
 ('RIFFLE', 1, 'BBB', 2006) ('RIFFLE', 2, 'AAA', 2006)]
```
