Fix bug in WeightWindowGenerator for empty energy bounds #5017

Job	Run time
Python 3.11 (omp=n, mpi=n, dagmc=n, ncrystal=n, libmesh=n, event=n vectfit=n)	1h 4m 19s
Python 3.11 (omp=y, mpi=n, dagmc=n, ncrystal=n, libmesh=n, event=n vectfit=n)	1h 27m 45s
Python 3.11 (omp=n, mpi=y, dagmc=n, ncrystal=n, libmesh=n, event=n vectfit=n)	1h 1m 54s
Python 3.11 (omp=y, mpi=y, dagmc=n, ncrystal=n, libmesh=n, event=n vectfit=n)	1h 18m 24s
Python 3.12 (omp=n, mpi=n, dagmc=, ncrystal=, libmesh=, event= vectfit=)	49m 35s
Python 3.13 (omp=n, mpi=n, dagmc=, ncrystal=, libmesh=, event= vectfit=)	52m 36s
Python 3.11 (omp=y, mpi=y, dagmc=y, ncrystal=, libmesh=, event= vectfit=)	1h 58m 36s
Python 3.11 (omp=n, mpi=n, dagmc=, ncrystal=y, libmesh=, event= vectfit=)	1h 9m 17s
Python 3.11 (omp=y, mpi=y, dagmc=, ncrystal=, libmesh=y, event= vectfit=)	1h 33m 36s
Python 3.11 (omp=y, mpi=n, dagmc=, ncrystal=, libmesh=y, event= vectfit=)	1h 44m 5s
Python 3.11 (omp=y, mpi=n, dagmc=, ncrystal=, libmesh=, event=y vectfit=)	1h 37m 42s
Python 3.11 (omp=n, mpi=y, dagmc=, ncrystal=, libmesh=, event= vectfit=y)	1h 8m 11s
finish	3s
	15h 46m 3s

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