Bug 136241 [regression]Preview template in web viewer and pdf didn't get correct effect.
Description: Preview template items in web viewer and pdf didn't get correct effect. Steps to reproduce: 1. Create template items. 2. Preview in Web Viewer and pdf. Expected result: Same effect as in html. Actual result: In web viewer, see only blank box. In pdf, blank page.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/core/DesignElement.java
/**
	 * Checks all structures in the specific property whose type is structure
	 * list property type. This method is used for element semantic check. The
	 * error is kept in the report design's error list.
	 * 
	 * @param module
	 *            the module
	 * @param propName
	 *            the name of the structure list type
	 * @return the list of the errors found in validation, each of which is the
	 *         <code>SemanticException</code> object.
	 */
	protected List validateStructureList( Module module, String propName )
	{
		return StructureListValidator.getInstance( ).validate( module, this,
				propName );
	}
	/**
	 * Checks all structures in the specific property whose type is structure
	 * list property type. This method is used in command. If any error is
	 * found, the exception will be thrown.
	 * 
	 * @param module
	 *            the module
	 * @param propDefn
	 *            the property definition of the list property
	 * @param list
	 *            the structure list to check
	 * @param toAdd
	 *            the structure to add. This parameter maybe is