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
* @param model
	 * @param externalProcessor
	 */
	protected final void prepareStyles( Chart model,
			IStyleProcessor externalProcessor )
	{
		Stack token = new Stack( );
		token.push( StyledComponent.CHART_ALL_LITERAL );
		prepareComponent( model, token, model, externalProcessor );
		token.clear( );
	}
	private void prepareComponent( Chart model, Stack token, Object component,
			IStyleProcessor externalProcessor )
	{
		
		if ( component instanceof EObject )
		{
			StyledComponent currentToken = getStyledComponent( (EObject) component );
			boolean pushed = false;
			if ( currentToken != null )
			{
				token.push( currentToken );
				pushed = true;
			}
			applyStyles( model,
					(StyledComponent) token.peek( ),
					(EObject) component,
					externalProcessor );
			
			for ( Iterator itr = ( (EObject) component ).eContents( )