BUG: localize function does not work with SVD method

[kzsigmond]

Describe the problem:

Localizing the orbitals with fanpy.interface.pyscf_tools.localize and providing method=svd results in an error.

Code that reproduces the bug:

from fanpy.interface.pyscf_tools import localize

name = "data/data_h2.xyz"
# method options: None, SVD, iao, boys, pm, er
result = localize(name, "sto-6g", method='svd')
print(result["t_ab_mo"])

The xyz file is from tests/data

Traceback error:

converged SCF energy = -0.900206370773928
converged SCF energy = -0.900206370773927
pyscf mo energies: [-0.75482456  1.19029906]
computed mo energies: [-0.75482456  1.19029906]
pyscf hf electronic energy: -2.2479152656526336
computed hf electronic energy: -2.2479152656526336
Traceback (most recent call last):
  File "/home/quintana/Documents/code/Fanpy/tests/test_calc.py", line 5, in <module>
    result = localize(name, "sto-6g", method='svd')
  File "/home/quintana/Documents/code/Fanpy/fanpy/interface/pyscf_tools.py", line 427, in localize
    minao_inds = np.array([system_inds[int(re.search(r'^(\d+)\s+', label).group(1))] for label in minao_labels])
  File "/home/quintana/Documents/code/Fanpy/fanpy/interface/pyscf_tools.py", line 427, in <listcomp>
    minao_inds = np.array([system_inds[int(re.search(r'^(\d+)\s+', label).group(1))] for label in minao_labels])
TypeError: 'NoneType' object is not subscriptable

Package versions:

python: 3.10
fanpy: N/A
numpy: 1.26.4

Additonal comments

The other methods have a similar issue. If one of the inputs is required (e.g. system inds, etc.), localize should raise an error sooner.