code: def getfieldidd_item(bch, fieldname, iddkey):
      
      fieldidd = getfieldidd(bch, fieldname)
      try:
          return fieldidd[iddkey]
      except KeyError as e:
          return []
docs: return an item from the fieldidd, given the iddkey
      will return and empty list if it does not have the iddkey
      or if the fieldname does not exist