Ensuring only exact "vacuum" assignment is detected as vacuum #5033

Job	Run time
Python 3.11 (omp=n, mpi=n, dagmc=n, ncrystal=n, libmesh=n, event=n vectfit=n)	1h 20m 20s
Python 3.11 (omp=y, mpi=n, dagmc=n, ncrystal=n, libmesh=n, event=n vectfit=n)	1h 40m 11s
Python 3.11 (omp=n, mpi=y, dagmc=n, ncrystal=n, libmesh=n, event=n vectfit=n)	58m 17s
Python 3.11 (omp=y, mpi=y, dagmc=n, ncrystal=n, libmesh=n, event=n vectfit=n)	1h 22m 54s
Python 3.12 (omp=n, mpi=n, dagmc=, ncrystal=, libmesh=, event= vectfit=)	49m 43s
Python 3.13 (omp=n, mpi=n, dagmc=, ncrystal=, libmesh=, event= vectfit=)	53m 16s
Python 3.11 (omp=y, mpi=y, dagmc=y, ncrystal=, libmesh=, event= vectfit=)	1h 50m 56s
Python 3.11 (omp=n, mpi=n, dagmc=, ncrystal=y, libmesh=, event= vectfit=)	1h 15m 5s
Python 3.11 (omp=y, mpi=y, dagmc=, ncrystal=, libmesh=y, event= vectfit=)	1h 46m 39s
Python 3.11 (omp=y, mpi=n, dagmc=, ncrystal=, libmesh=y, event= vectfit=)	1h 39m 48s
Python 3.11 (omp=y, mpi=n, dagmc=, ncrystal=, libmesh=, event=y vectfit=)	1h 49m 1s
Python 3.11 (omp=n, mpi=y, dagmc=, ncrystal=, libmesh=, event= vectfit=y)	1h 7m 31s
finish	3s
	16h 33m 44s

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