Bug 167511 [Block]NPE when using customized IStyleProcessor with Chart Generator and no Chart will be rendered
Use a customized IStyleProcessor with Generator.build() and the chart will not be rendered in UI.
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/factory/Generator.java
}
		else if ( iChartType == WITHOUT_AXES )
		{
			PlotWithoutAxes pwoa = (PlotWithoutAxes) gcs.getComputations( );
			try
			{
				pwoa.compute( boPlot );
			}
			catch ( RuntimeException ex )
			{
				throw new ChartException( ChartEnginePlugin.ID,
						ChartException.GENERATION,
						ex );
			}
			logger.log( ILogger.INFORMATION,
					Messages.getString( "info.compute.elapsed.time.without.axes", 
							new Object[]{
								new Long( System.currentTimeMillis( ) - lTimer )
							},
							gcs.getRunTimeContext( ).getULocale( ) ) );
		}
		ScriptHandler.callFunction( gcs.getRunTimeContext( ).getScriptHandler( ),
				ScriptHandler.AFTER_COMPUTATIONS,
				cm,
				gcs.getComputations( ) );
	}
	/**
	 * Draws a previously built chart using the specified device renderer into a
	 * target output device.
	 *