genmod models produces no header lines in the VCF when `--processes 1` in 3.10.2, causing downstream tools to fail. Command: ``` genmod \ models \ --whole_gene --temp_dir ./ \ --reduced_penetrance reduced_penetrance.tsv \ --family_file FAM.ped \ --processes 1 \ --outfile FAM_svs_genmod_models_models.vcf \ FAM_svs_genmod_annotate_annotate.vcf ``` [FAM_svs_genmod_annotate_annotate.vcf.txt](https://github.com/user-attachments/files/24381305/FAM_svs_genmod_annotate_annotate.vcf.txt) [FAM.ped.txt](https://github.com/user-attachments/files/24381307/FAM.ped.txt) [reduced_penetrance.tsv.txt](https://github.com/user-attachments/files/24381306/reduced_penetrance.tsv.txt)