Bug 152948 Print as pdf not working for bar chart having Y-Series interactivity.
In BIRT2.1 release, a bar chart having a drill-through set on its Y-Series when rendered works fine, but on clicking the print as pdf option, produces a blank page. In the same report, if the drill-through is set on the chart area interactivity, everything including the print as pdf option works fine.
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/service/ViewerHTMLActionHandler.java
link.append( ParameterAccessor.getQueryParameterString(
				ParameterAccessor.PARAM_MASTERPAGE, String
						.valueOf( this.isMasterPageContent ) ) );
		if ( realBookmark )
		{
			link.append( "#" ); 
			link.append( bookmark );
		}
		else
		{
			link.append( ParameterAccessor.getQueryParameterString(
					ParameterAccessor.PARAM_BOOKMARK, bookmark ) );
		}
		return link.toString( );
	}
	/**
	 * builds URL for drillthrough action
	 * 
	 * @param action
	 *            instance of the IAction instance
	 * @param context
	 *            the context for building the action string
	 * @return a URL
	 */
	protected String buildDrillAction( IAction action, IReportContext context )
	{
		if ( action == null || context == null )
			return null;
		String baseURL = null;
		Object renderContext = getRenderContext( context );