<th:block th:if="${_title != null}"> <th:block th:replace="${_title}"></th:block> </th:block> <th:block th:unless="${_title != null}"> <th:block th:if="${#strings.isEmpty(site.subtitle)}" th:text="${site.title}"></th:block> <th:block th:unless="${#strings.isEmpty(site.subtitle)}" th:text="|${site.title} - ${site.subtitle}|"></th:block> </th:block>