Bug 143890 [Smoke]Chart cann't preview as web view
Details: [Smoke]Chart cann't preview as web view Setp: 1.Add a chart on report design. 2.Preview as web view. Actual result: The chart can't be preview on web view.
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/service/ReportEngineService.java
context.put( EngineConstants.APPCONTEXT_BIRT_VIEWER_HTTPSERVET_REQUEST,
				request );
		context.put( EngineConstants.APPCONTEXT_CLASSLOADER_KEY,
				ReportEngineService.class.getClassLoader( ) );
		HTMLRenderContext ctx = new HTMLRenderContext( );
		ctx.setImageDirectory( "images" ); 
		context.put( EngineConstants.APPCONTEXT_HTML_RENDER_CONTEXT, ctx );
		if ( ParameterAccessor.PARAM_FORMAT_PDF.equalsIgnoreCase( format ) )
		{
			context.put( EngineConstants.APPCONTEXT_PDF_RENDER_CONTEXT,
					createPDFrenderContext( ) );
		}
		else if ( htmlRenderContext != null )
		{
			context.put( EngineConstants.APPCONTEXT_HTML_RENDER_CONTEXT,
					htmlRenderContext );
		}
		else
		{
			context
					.put( EngineConstants.APPCONTEXT_HTML_RENDER_CONTEXT,
							createHTMLrenderContext( svgFlag, request
									.getServletPath( ) ) );
		}
		runAndRenderTask.setAppContext( context );
		try
		{
			runAndRenderTask.run( );
		}
		catch ( BirtException e )