fix ImportError: cannot import pymatgen.symmetry.analyzer.SymmetryUnd… #1423

Job	Run time
find-scripts	3s
tests (ubuntu-latest, 1) / tests	1m 45s
tests (ubuntu-latest, 2) / tests	2m 17s
tests (ubuntu-latest, 3) / tests	1m 48s
tests (ubuntu-latest, 4) / tests	1m 53s
test-scripts (examples/make_assets/scatter.py)	1m 24s
test-scripts (examples/make_assets/xrd.py)	2m 22s
test-scripts (examples/make_assets/coordination.py)	1m 8s
test-scripts (examples/make_assets/uncertainty.py)	1m 5s
test-scripts (examples/make_assets/rainclouds.py)	1m 4s
test-scripts (examples/make_assets/histogram.py)	1m 13s
test-scripts (examples/make_assets/phonons.py)	1m 5s
test-scripts (examples/make_assets/structure_viz.py)	1m 13s
test-scripts (examples/make_assets/rdf.py)	1m 53s
test-scripts (examples/make_assets/powerups.py)	1m 12s
test-scripts (examples/make_assets/relevance.py)	1m 10s
test-scripts (examples/make_assets/sankey.py)	1m 38s
test-scripts (examples/make_assets/ptable/ptable_matplotlib.py)	3m 54s
test-scripts (examples/make_assets/ptable/ptable_plotly.py)	1m 5s
test-scripts (examples/make_assets/symmetry.py)	2m 8s
	31m 20s

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