SVD algorithm will segfault if matrix has 0 rows or 0 columns

[cake4289]

extern crate rulinalg;
use rulinalg::matrix::Matrix;

#[test]
fn segfault() {
    let m = Matrix::<f64>::new(0, 0, &[][..]);
    m.svd();
}

will segfault in release mode, "attempt to subtract with overflow" in debug mode.