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
return null;
		switch ( actionDefn.getType( ) )
		{
			case IAction.ACTION_BOOKMARK :
			{
				return buildBookmarkAction( actionDefn, context );
			}
			case IAction.ACTION_HYPERLINK :
			{
				return actionDefn.getActionString( );
			}
			case IAction.ACTION_DRILLTHROUGH :
			{
				return buildDrillAction( actionDefn, context );
			}
		}
		return null;
	}
	/**
	 * Build URL for bookmark.
	 * 
	 * @param action
	 * @param context
	 * @return the bookmark url
	 */
	protected String buildBookmarkAction( IAction action, IReportContext context )
	{
		if ( action == null || context == null )
			return null;