code: private void createChildTopicrefStubs(final List<Element> topicrefs) {
          if (!topicrefs.isEmpty()) {
              for (final Element currentElem : topicrefs) {
                  final String href = getValue(currentElem, ATTRIBUTE_NAME_HREF);
                  final String chunk = getValue(currentElem,ATTRIBUTE_NAME_CHUNK);
                  if (href == null && chunk != null) {
                      generateStumpTopic(currentElem);
                  }
                  createChildTopicrefStubs(getChildElements(currentElem, MAP_TOPICREF));
              }
          }
      }
docs: Before combining topics in a branch, ensure any descendant topicref with @chunk and no @href has a stub