The problem fixed here is that of the missing molecule container. This was caused by the weirdness
of the Scientific python PDB reader splitting one modified lactose molecule into 2 molecules. The
lactose part was unnamed, while the modifier was named after the residues 'UNK'. The
generic_fns.mol_res_spin.return_molecule() function was having problems with this concept of the
first molecule unnamed and the second named. This is now fixed and the unnamed molecule can be
retrieved.
