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
bindData( expressionEvaluator, null, chart, rtc );
	}
	/**
	 * Binds data to the chart model using a row expression evaluator. The
	 * evaluator provides the ability to evaluate the expressions set in the
	 * chart on a row context.If the given IActionEvaluator is not null, then it
	 * will also search available expressions within the action and bind it as
	 * the user dataSets.
	 * 
	 * @param expressionEvaluator
	 *            The data row expression evaluator implementation
	 * @param iae
	 *            An IActionEvaluator instance.
	 * @param chart
	 *            The chart model
	 * @param rtc
	 *            The runtime context
	 * @throws ChartException
	 * 
	 * @since 2.0
	 */
	public void bindData( IDataRowExpressionEvaluator expressionEvaluator,
			IActionEvaluator iae, Chart chart, RunTimeContext rtc )
			throws ChartException
	{
		DataProcessor helper = new DataProcessor( rtc, iae );
		helper.generateRuntimeSeries( expressionEvaluator, chart );
	}
	/**
	 * Since v2, it must be called before build( ), and should only be called