code: public static String extractAttributeValueNoEmptyCheck(Entry entry, String attributeType) {
          Attribute attribute = entry.get(attributeType);
          if (attribute == null) {
              return null;
          }
          try {
              return attribute.getString();
          } catch (LdapInvalidAttributeValueException e) {
              throw new LdapRuntimeException(e);
          }
      }
docs: Returns the value of the attribute of attributeType from entry.