rtkfdk app returns NaN values for parallel geometry

[lesaintjerome]

Steps to reproduce : rtksimulatedgeometry -n 720 -a 180 -o g720.xml --sdd 0 rtkprojectshepploganphantom -g g720.xml -o sl720.mha --dimension 500,3 --spacing 1 rtkfdk -g g720.xml -o bpb.mha -p . -r sl720.mha --dimension 500,1,500 --spacing 1

Add --nodisplaced on flag and it works fine.