code: public void includeSilent(String target, String element) {
  
          try {
              include(target, element, null);
          } catch (Throwable t) {
              // ignore
          }
      }
docs: Includes a named sub-element suppressing all Exceptions that occur during the include,
  otherwise the same as using {@link #include(String, String, Map)}.<p>
  
  This is a convenience method that allows to include elements on a page without checking
  if they exist or not. If the target element does not exist, nothing is printed to
  the JSP output.<p>
  
  @param target the target URI of the file in the OpenCms VFS (can be relative or absolute)
  @param element the element (template selector) to display from the target