code: def get_item_string(items_list):
      
      if not items_list:
          return ''
      string_list = []
      for item in items_list:
          try:
              name = item.name
              string_list.append(name)
          except AttributeError:
              pass
      return ":".join(string_list)
docs: take in a list of pmag_objects
      return a colon-delimited list of the findable names