Bug 167511 [Block]NPE when using customized IStyleProcessor with Chart Generator and no Chart will be rendered
Use a customized IStyleProcessor with Generator.build() and the chart will not be rendered in UI.
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/factory/Generator.java
&& type != null )
			{
				type = getParentType( type );
			}
		}
		while ( !updateHierarchyStyle( model, type, implicitProcessor, rStyle )
				&& type != null )
		{
			type = getParentType( type );
		}
		return rStyle.style;
	}
	private StyledComponent getParentType( StyledComponent type )
	{
		switch ( type.getValue( ) )
		{
			case StyledComponent.CHART_ALL :
				return null;
			case StyledComponent.CHART_TITLE :
				return StyledComponent.CHART_BACKGROUND_LITERAL;
			case StyledComponent.CHART_BACKGROUND :
				return StyledComponent.CHART_ALL_LITERAL;
			case StyledComponent.PLOT_BACKGROUND :
				return StyledComponent.CHART_BACKGROUND_LITERAL;
			case StyledComponent.LEGEND_BACKGROUND :
				return StyledComponent.CHART_BACKGROUND_LITERAL;
			case StyledComponent.LEGEND_LABEL :
				return StyledComponent.LEGEND_BACKGROUND_LITERAL;
			case StyledComponent.AXIS_TITLE :
				return StyledComponent.PLOT_BACKGROUND_LITERAL;