Bug 135207 parameter dialog is not displayed when drill through to a PDF report that contains parameter with no default value
steps to reproduce: - create 1st report - add a report parameter (no default value) - create 2nd report - add a label "link" - edit hyperlink property (type: drill-through, target report format: PDF) - preview 1st report - click on "link" expected behavior: - parameter dialog should be displayed - target report is rendered in PDF format actual behavior: - "Some required parameter values are not set or set to incompatible data type." was displayed instead.
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/servlet/ViewerServlet.java
{
	/**
	 * TODO: what's this?
	 */
	private static final long serialVersionUID = 1L;
	/**
	 * Local initialization.
	 * 
	 * @return
	 */
	protected void __init( ServletConfig config )
	{
		BirtReportServiceFactory.init( new BirtViewerReportService( config ) );
		viewer = new FramesetFragment( );
		viewer.buildComposite( );
		engine = new EngineFragment( );
	}
	/**
	 * Init context.
	 * 
	 * @param request
	 *            incoming http request
	 * @return
	 */
	protected IContext __getContext( HttpServletRequest request,
			HttpServletResponse response )
	{