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/util/ModelUtil.java
* @return a list contained filtrated notification tasks
	 */
	public static List filterNotificationTasks( List tasks )
	{
		List notifications = new ArrayList( );
		for ( int i = 0; i < tasks.size( ); i++ )
		{
			RecordTask task = (RecordTask) tasks.get( i );
			if ( task instanceof NotificationRecordTask )
				notifications.add( task );
		}
		return EventFilter.getInstance( ).filter( notifications );
	}
	/**
	 * Filtrates the table layout tasks.
	 * 
	 * @param tasks
	 *            the table layout tasks
	 * @return a list contained filtrated table layout tasks
	 */
	public static List filterLayoutTasks( List tasks )
	{
		List retList = new ArrayList( );
		Set elements = new LinkedHashSet( );
		for ( int i = 0; i < tasks.size( ); i++ )
		{
			RecordTask task = (RecordTask) tasks.get( i );
			if ( task instanceof LayoutRecordTask )
			{
				DesignElement compoundElement = (DesignElement) ( (LayoutRecordTask) task )