Allow out_file to be alternatively not generated
Allow out_file to be alternatively not generated

FCP-INDI/nipype,wanderine/nipype,dgellis90/nipype,arokem/nipype,glatard/nipype,fprados/nipype,gerddie/nipype,wanderine/nipype,FCP-INDI/nipype,JohnGriffiths/nipype,Leoniela/nipype,rameshvs/nipype,arokem/nipype,gerddie/nipype,JohnGriffiths/nipype,grlee77/nipype,carolFrohlich/nipype,FredLoney/nipype,sgiavasis/nipype,mick-d/nipype,blakedewey/nipype,grlee77/nipype,blakedewey/nipype,FredLoney/nipype,dgellis90/nipype,fprados/nipype,sgiavasis/nipype,dgellis90/nipype,carolFrohlich/nipype,grlee77/nipype,pearsonlab/nipype,blakedewey/nipype,glatard/nipype,iglpdc/nipype,wanderine/nipype,JohnGriffiths/nipype,fprados/nipype,Leoniela/nipype,arokem/nipype,pearsonlab/nipype,dgellis90/nipype,FCP-INDI/nipype,arokem/nipype,blakedewey/nipype,wanderine/nipype,carlohamalainen/nipype,sgiavasis/nipype,mick-d/nipype_source,mick-d/nipype_source,FredLoney/nipype,mick-d/nipype,rameshvs/nipype,sgiavasis/nipype,glatard/nipype,iglpdc/nipype,dmordom/nipype,glatard/nipype,mick-d/nipype_source,carlohamalainen/nipype,mick-d/nipype,carolFrohlich/nipype,rameshvs/nipype,FCP-INDI/nipype,iglpdc/nipype,carolFrohlich/nipype,gerddie/nipype,rameshvs/nipype,Leoniela/nipype,mick-d/nipype,gerddie/nipype,JohnGriffiths/nipype,grlee77/nipype,iglpdc/nipype,pearsonlab/nipype,dmordom/nipype,dmordom/nipype,carlohamalainen/nipype,pearsonlab/nipype