csg_get_interaction_property: add error if bond with that name was not found
csg_get_interaction_property: add error if bond with that name was not found

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