fix workflow creation
fix workflow creation

poldracklab/preprocessing-workflow,poldracklab/fmriprep,oesteban/fmriprep,oesteban/preprocessing-workflow,poldracklab/fmriprep,oesteban/preprocessing-workflow,poldracklab/fmriprep,oesteban/fmriprep,oesteban/fmriprep,poldracklab/preprocessing-workflow