Bug 122850 Table/list should not be able to be inserted in Master Page mode.
Description: Table/list should not be able to be inserted in Master Page mode. Steps to reproduce: 1. New a report and transfer to Master Page mode. 2. New a datasource and dataset 3. Drag a list/table to page header/footer, bind it to dataset and drag some columns inside. 4. Save and preview Expected result: Insert list/table item in master page should be forbidden. Actual result: They are allowed and preview showed "undefine" in page
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/core/DesignElement.java
}
		return list;
	}
	/**
	 * Validates only this element without its contents, and return error list.
	 * The derived class should override this method to define specific
	 * validation rules.
	 * 
	 * @param module
	 *            the module
	 * @return the list of the errors found in validation, each of which is the
	 *         <code>SemanticException</code> object.
	 */
	public List validate( Module module )
	{
		errors = new ArrayList( );
		
		errors.addAll( UnsupportedElementValidator.getInstance( ).validate(
				module, this ) );