I'm using a theme generated by `yo liferay-theme` on Liferay 7.2. I set the  default portlet decorator to barebone like this:
<look-and-feel>
    <compatibility>
        <version>7.2.0+</version>
    </compatibility>
    <theme id="x" name="x">
        <template-extension>ftl</template-extension>
        <portlet-decorator id="barebone" name="Barebone">
            <default-portlet-decorator>true</default-portlet-decorator>
            <portlet-decorator-css-class>portlet-barebone</portlet-decorator-css-class>
        </portlet-decorator>
I expected portlet_display.getPortletDecoratorId() to return "barebone" but it returns nothing.Does anybody know what I am doing wrong? How do I get the portlet decorator id in LF 7.2?