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
+ " * \n" 
			+ " * @param axis\n" 
			+ " *            Axis\n" 
			+ " * @param markerLine\n" 
			+ " *            MarkerLine\n" 
			+ " * @param context\n" 
			+ " *            IChartScriptContext\n" 
			+ " */\n" 
			+ "//function beforeDrawMarkerLine( axis, markerLine, context ){}\n" 
			+ "\n" 
			+ "/**\n" 
			+ " * Called before drawing each marker range in an Axis.\n" 
			+ " * \n" 
			+ " * @param axis\n" 
			+ " *            Axis\n" 
			+ " * @param markerRange\n" 
			+ " *            MarkerRange\n" 
			+ " * @param context\n" 
			+ " *            IChartScriptContext\n" 
			+ " */\n" 
			+ "//function beforeDrawMarkerRange( axis, markerRange, context ){}\n" 
			+ "\n" 
			+ "/**\n" 
			+ " * Called before drawing each datapoint graphical representation or marker.\n" 
			+ " * \n" 
			+ " * @param dph\n" 
			+ " *            DataPointHints\n" 
			+ " * @param fill\n" 
			+ " *            Fill\n" 
			+ " * @param context\n"