fixed mapnode output gathering for nodes that have no outputs
fixed mapnode output gathering for nodes that have no outputs

git-svn-id: 24f545668198cdd163a527378499f2123e59bf9f@1925 ead46cd0-7350-4e37-8683-fc4c6f79bf00

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