The itersource iterables key is a tuple only if there is more than one itersource iterable field.
The itersource iterables key is a tuple only if there is more than one itersource iterable field.

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