added logic to base to add fmap dependent workflows only if a fmap workflow is generated
added logic to base to add fmap dependent workflows only if a fmap workflow is generated

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