Bugfixes in StructurePlot and error handling for Atoms.get_symmetry

[pmrv]

There were some small typos in StructurePlots. Additionally I found that for "weird" structures spglib can run into internal errors when calling get_symmetry. This then produced unrelated errors in the Symmetry class, because we're not expecting spglib to fail. So I've added a simple error class and None checks.

[coveralls]

Pull Request Test Coverage Report for Build 3408972172

• 18 of 26 (69.23%) changed or added relevant lines in 2 files are covered.
• 328 unchanged lines in 8 files lost coverage.
• Overall coverage increased (+0.03%) to 68.667%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pyiron_atomistics/atomistics/structure/structurestorage.py	1	5	20.0%
pyiron_atomistics/atomistics/structure/symmetry.py	17	21	80.95%

Files with Coverage Reduction	New Missed Lines	%
pyiron_atomistics/atomistics/structure/structurestorage.py	1	43.22%
pyiron_atomistics/interactive/scipy_minimizer.py	2	87.39%
pyiron_atomistics/atomistics/structure/factories/materialsproject.py	21	41.86%
pyiron_atomistics/atomistics/structure/has_structure.py	21	68.18%
pyiron_atomistics/lammps/base.py	36	81.06%
pyiron_atomistics/atomistics/job/atomistic.py	61	75.6%
pyiron_atomistics/vasp/base.py	73	65.51%
pyiron_atomistics/sphinx/base.py	113	81.71%

Totals
Change from base Build 3228348380:	0.03%
Covered Lines:	12108
Relevant Lines:	17633

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💛 - Coveralls

[samwaseda]

It looks good to me. Can you maybe add a test? The symmetry search typically fails when there are two atoms on top of each other, so if you create a structure by:

structure = pr.create.structure.bulk('Al', cubic=True)
structure += structure[-1]
structure.get_symmetry()

it should fail.

[stale]

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