Improvements to PWA template: remove menus, widgets and WordAds; add …

…minimum height for content area.

header.php

@@ -172,7 +172,7 @@
 
 					<?php
 					// If logo is not centered.
-					if ( false === $header_center_logo ) {
+					if ( false === $header_center_logo && has_nav_menu( 'primary-menu' ) ) {
 						get_template_part( 'template-parts/header/header', 'search' );
 					}
 					?>

offline.php

@@ -5,6 +5,16 @@
  * @package Newspack
  */
 
+// Prevent showing nav menus.
+add_filter( 'has_nav_menu', '__return_false' );
+
+// Prevent showing widgets.
+add_filter( 'is_active_sidebar', '__return_false' );
+
+// Disable WordAds in the header.
+// See: https://wordads.co/2018/02/07/how-to-control-jetpack-ad-placements-using-hooks/
+add_filter( 'wordads_header_disable', '__return_true' );
+
 get_header();
 ?>
 	<section id="primary" class="content-area">

sass/layout/_layout.scss

@@ -20,6 +20,7 @@
 }
 
 .site-content {
+	min-height: 30vh;
 	overflow: hidden;
 }