code: def _combine_nt_vals(lst0_lstn, flds, dflt_null):
      
      vals = []
      for fld in flds:
          fld_seen = False
          # Set field value using the **first** value seen in list of nt lists(lst0_lstn)
          for nt_curr in lst0_lstn:
              if hasattr(nt_curr, fld):
                  vals.append(getattr(nt_curr, fld))
                  fld_seen = True
                  break
          # Set default value if GO ID or nt value is not present
          if fld_seen is False:
              vals.append(dflt_null)
      return vals
docs: Given a list of lists of nts, return a single namedtuple.