fix: outputs never sets outfile if defined.
fix: outputs never sets outfile if defined.

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