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The latest change by @gridley introduced automatic checking for the number of DNP groups (6 or 8 depending on the nuclear data library) to remove extra zeros if there are only 6 groups.
The script works for cases with secondary branches (resulting from Serpent automated burnup sequences or varying control rod positions)
The script fails for cases without secondary branches as the "branch" variable is null. The fix simply involves removing the "branch" variable call for these cases in the DNP group check.
The if-else code portions are also swapped to maintain consistency with the original code.