code: public static List<String> extractAttributeEmptyCheck(List<Entry> entries, String attributeType) {
          List<String> result = new LinkedList<String>();
          for (Entry e : entries) {
              result.add(extractAttributeEmptyCheck(e, attributeType));
          }
          return result;
      }
docs: Returns the value of the first occurence of attributeType from each entry.