Fix for plotting model with multi-group cross sections #7564

Job	Run time
filter-changes	4s
Python 3.12 (omp=n, mpi=n, dagmc=, libmesh=, event= vectfit=)	1h 12m 3s
Python 3.11 (omp=y, mpi=n, dagmc=n, libmesh=n, event=n vectfit=n)	1h 57m 25s
Python 3.11 (omp=y, mpi=n, dagmc=, libmesh=, event=y vectfit=)	2h 4m 21s
Python 3.13 (omp=n, mpi=n, dagmc=, libmesh=, event= vectfit=)	1h 12m 35s
Python 3.11 (omp=y, mpi=y, dagmc=, libmesh=y, event= vectfit=)	1h 58m 19s
Python 3.11 (omp=y, mpi=y, dagmc=y, libmesh=, event= vectfit=)	2h 3m 39s
Python 3.11 (omp=y, mpi=y, dagmc=n, libmesh=n, event=n vectfit=n)	1h 56m 48s
Python 3.11 (omp=n, mpi=n, dagmc=n, libmesh=n, event=n vectfit=n)	1h 33m 7s
Python 3.11 (omp=n, mpi=y, dagmc=n, libmesh=n, event=n vectfit=n)	1h 12m 46s
Python 3.11 (omp=y, mpi=n, dagmc=, libmesh=y, event= vectfit=)	2h 7m 12s
Python 3.11 (omp=n, mpi=y, dagmc=, libmesh=, event= vectfit=y)	1h 31m 39s
coverage	4s
Check CI status	3s
	18h 50m 5s

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