Bug 140620 Chart scripting errors are ignored
Write a chart with an invalid script, the execution simply ignores the script. This makes it difficult to debug scripting. The error message is also not precise and needs improvements.
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/factory/Generator.java
*            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 );
		ResultSetWrapper wrapper = helper.mapToChartResultSet( expressionEvaluator,
				chart );
		helper.generateRuntimeSeries( chart, wrapper );
	}
	/**
	 * Since v2, it must be called before build( ), and should only be called
	 * once per design model.
	 * 
	 * @param model
	 *            Chart design model
	 * @param externalContext
	 *            External Context
	 * @param locale
	 *            Locale
	 * @return a runtime context used by build( )
	 *