csg_get_interaction_property: fixed a bug in default code
csg_get_interaction_property: fixed a bug in default code

MrTheodor/csg,junghans/csg,MrTheodor/csg,junghans/csg,votca/csg,junghans/csg,MrTheodor/csg,votca/csg,votca/csg,MrTheodor/csg,MrTheodor/csg,junghans/csg,junghans/csg,votca/csg,junghans/csg