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
javahandler.afterRendering( (GeneratedChartState) tmpArgs[0],
					(IChartScriptContext) tmpArgs[1] );
		}
		else if ( ScriptHandler.BEFORE_DRAW_BLOCK.equals( name ) )
		{
			javahandler.beforeDrawBlock( (Block) tmpArgs[0],
					(IChartScriptContext) tmpArgs[1] );
		}
		else if ( ScriptHandler.AFTER_DRAW_BLOCK.equals( name ) )
		{
			javahandler.afterDrawBlock( (Block) tmpArgs[0],
					(IChartScriptContext) tmpArgs[1] );
		}
		else if ( ScriptHandler.BEFORE_DRAW_LEGEND_ENTRY.equals( name ) )
		{
			javahandler.beforeDrawLegendEntry( (Label) tmpArgs[0],
					(IChartScriptContext) tmpArgs[1] );
		}
		else if ( ScriptHandler.AFTER_DRAW_LEGEND_ENTRY.equals( name ) )
		{
			javahandler.afterDrawLegendEntry( (Label) tmpArgs[0],
					(IChartScriptContext) tmpArgs[1] );
		}
		else if ( ScriptHandler.BEFORE_DRAW_SERIES.equals( name ) )
		{
			javahandler.beforeDrawSeries( (Series) tmpArgs[0],
					(ISeriesRenderer) tmpArgs[1],
					(IChartScriptContext) tmpArgs[2] );
		}
		else if ( ScriptHandler.AFTER_DRAW_SERIES.equals( name ) )