Bug 119398 Using RenderTask to render pdf file but the master page information lost.
Description: Using RenderTask to render pdf file but the master page information lost. Steps to reproduce: 1. Generate attached case1.rptdesign to report document 2. Using RenderTask to render report document to pdf file. Expected result: Master Page contents show in pdf file. Actual result: In generated pdf file, I saw "NO DATA FOUND!!!" instead of master page contents
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/executor/ReportItemExecutor.java
* @param item
	 *            the report item design
	 * @param emitter
	 *            the report emitter
	 */
	public abstract void execute( ReportItemDesign item, IContentEmitter emitter );
	/**
	 * reset the state of the report item executor. This operation will reset
	 * all property of this object
	 * 
	 */
	public void reset( )
	{
	}
	/**
	 * Calculate the bookmark value which is set to
	 * <code>ReportItemContent</code> if the bookmark is not null
	 * 
	 * @param item
	 *            the ReportItemContent object
	 */
	protected void processBookmark( ReportItemDesign item, IContent itemContent )
	{
		Expression bookmark = item.getBookmark( );
		if ( bookmark != null )
		{
			Object tmp = context.evaluate( bookmark );
			if ( tmp != null )
			{
				itemContent.setBookmark( tmp.toString( ) );