Add `test_vasp_out_with_empty_contcar`

# flake8: noqa

import inspect

import shutil

from pathlib import Path

import numpy as np

import pytest

    print(result1)

    print(result2)

    assert len(compare_atoms(result1, result2)) == 0

def test_with_empty_contcar(testdir, outcar) -> None:

    """Test `read_vasp_out` with empty CONTCAR for reading constraints."""

    Path('CONTCAR').touch()

    shutil.copy2(outcar, 'OUTCAR')

    atoms = read('OUTCAR')

    assert isinstance(atoms, Atoms)