Fix bug in Mesh::material_volumes for void materials #5358

Job	Run time
Python 3.11 (omp=n, mpi=n, dagmc=n, ncrystal=n, libmesh=n, event=n vectfit=n)	1h 20m 34s
Python 3.11 (omp=y, mpi=n, dagmc=n, ncrystal=n, libmesh=n, event=n vectfit=n)	1h 31m 34s
Python 3.11 (omp=n, mpi=y, dagmc=n, ncrystal=n, libmesh=n, event=n vectfit=n)	59m 43s
Python 3.11 (omp=y, mpi=y, dagmc=n, ncrystal=n, libmesh=n, event=n vectfit=n)	1h 18m 43s
Python 3.12 (omp=n, mpi=n, dagmc=, ncrystal=, libmesh=, event= vectfit=)	51m 18s
Python 3.13 (omp=n, mpi=n, dagmc=, ncrystal=, libmesh=, event= vectfit=)	53m 27s
Python 3.11 (omp=y, mpi=y, dagmc=y, ncrystal=, libmesh=, event= vectfit=)	1h 54m 2s
Python 3.11 (omp=n, mpi=n, dagmc=, ncrystal=y, libmesh=, event= vectfit=)	1h 10m 48s
Python 3.11 (omp=y, mpi=y, dagmc=, ncrystal=, libmesh=y, event= vectfit=)	1h 47m 32s
Python 3.11 (omp=y, mpi=n, dagmc=, ncrystal=, libmesh=y, event= vectfit=)	1h 43m 7s
Python 3.11 (omp=y, mpi=n, dagmc=, ncrystal=, libmesh=, event=y vectfit=)	1h 43m 55s
Python 3.11 (omp=n, mpi=y, dagmc=, ncrystal=, libmesh=, event= vectfit=y)	1h 25m 27s
finish	2s
	16h 40m 12s

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