Errors in test_cifwriter and test_benchmark:

[kousuke-nakano]

Hi Genki,

I have implemented "test_benchmark" in test_core.py. (for CI/CD in the near future). pushed to the "dev" branch.

I got the following errors by pytest -v.

======================================= short test summary info =======================================
FAILED tests/test_core.py::test_cifwriter - assert 17 == 16
FAILED tests/test_core.py::test_benchmark - RuntimeError: Couldn't find symmetry.
======================== 2 failed, 18 passed, 1 skipped, 31 warnings in 24.44s ========================

The former one should be related to the recent improvement of the Ewald sum. would you check it?
The latter one, which I did not encounter in the previous benchmark test, seems to be related to pymatgen implementation. sga.get_symmetry_operations() failed for filename=SG5/SG5_cod_database_code_7202040_partial.cif

    # Read.
    self._structure = structure.copy()

    sga = PatchedSpacegroupAnalyzer(
        self._structure,
        symprec=self._symprec,
        angle_tolerance=self._angle_tolerance,
    )
    try:
        self._symmops = sga.get_symmetry_operations()
    except TypeError as exc:

      raise RuntimeError("Couldn't find symmetry.") from exc

E RuntimeError: Couldn't find symmetry.

xxxxx/shry/lib/python3.10/site-packages/shry/core.py:495: RuntimeError