Bug 148333 [Smoke]Set hyperlink-internal bookmark to a item. preview in html, system throws exeption
[Smoke]Set hyperlink-internal bookmark to a item. preview in html, system throws exeption Steps: 1.Create a label into layout 2.set bookmark "a" to label 3.Insert a image into layout 4.Set hyperlink-internal bookmart 5.Preview in html Actual Results: 1.system throws exception Error happened while running the report
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/service/ViewerHTMLActionHandler.java
{
			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, Object context )
	{
		String baseURL = null;
		if ( context != null )
		{
			if ( context instanceof HTMLRenderContext )
			{
				baseURL = ( (HTMLRenderContext) context ).getBaseURL( );
			}
			if ( context instanceof PDFRenderContext )