plugin/src/main/java/io/fabric8/maven/plugin/mojo/build/ResourceMojo.java
protected static Template getSingletonTemplate(KubernetesList resources) {
        // if the list contains a single Template lets unwrap it
        if (resources != null) {
            List<HasMetadata> items = resources.getItems();
            if (items != null && items.size() == 1) {
                HasMetadata singleEntity = items.get(0);
                if (singleEntity instanceof Template) {
                    return (Template) singleEntity;
                }
            }
        }
        return null;
    }
protected static Template getSingletonTemplate(KubernetesList resources) {
        // if the list contains a single Template lets unwrap it
        if (resources != null) {
            List<HasMetadata> items = resources.getItems();
            if (items != null && items.size() == 1) {
                HasMetadata singleEntity = items.get(0);
                if (singleEntity instanceof Template) {
                    return (Template) singleEntity;
                }
            }
        }
        return null;
    }
Returns the Template if the list contains a single Template only otherwise returns null