Creating a H5SparseMatrixCSC from a SparseMatrixCSC with zero dimension fails

The following code fails.

```julia
B = spzeros(0, 0)
filename = tempname()    
A = H5SparseMatrixCSC(filename, name, B)
@test sparse(A) ≈ B
```

I think the correct solution would be to allow `last(rows) < first(rows)` (and the same for `cols`), similar to how regular matrices work (e.g., `sprand(0, 0)[0:-1, :]` is valid, and returns a `0 x 0` matrix).