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/script/ScriptHandler.java
*/
	public static final String DEFAULT_JAVASCRIPT = "/**\n" 
			+ " * The chart script methods provide control on the chart databinding, generation and rendering.\n" 
			+ " *\n" 
			+ " * The methods have been commented in the following code, please uncomment and implement the\n" 
			+ " * ones you need. Note that for simplicity the \"after\" methods have not be included here.\n" 
			+ " *\n" 
			+ " * This script syntax follows JavaScript specifications, the Java classes that are referred to\n" 
			+ " * in the comments can be accessed as JavaScript classes. \n" 
			+ " *\n" 
			+ " * Script examples are available in the org.eclipse.birt.chart.examples plugin\n" 
			+ " */\n\n\n" 
			+ "/**\n" 
			+ " * Called before populating the series dataset using the DataSetProcessor.\n" 
			+ " * \n" 
			+ " * @param series\n" 
			+ " *            Series\n" 
			+ " * @param dataSetProcessor\n" 
			+ " *            DataSetProcessor\n" 
			+ " * @param context\n" 
			+ " *            IChartScriptContext\n" 
			+ " */\n" 
			+ "//function beforeDataSetFilled( series, dataSetProcessor, context ){}\n" 
			+ "\n" 
			+ "/**\n" 
			+ " * Called before generation of chart model to GeneratedChartState.\n" 
			+ " * \n" 
			+ " * @param chart\n" 
			+ " *            Chart Model\n" 
			+ " * @param context\n"