Twenty Seventeen: Fixes front page panels allow pages of any status t…

…o be shown.

If you have a published page set to a section but also private, draft, pending or trash at some point in the future it was still showing on the homepage. There was no clarity to the user what was happening. This adds in a check to the post_status variable before displaying panel content and adjusts the customizer to show a placeholder if the page is draft,trashed,deleted. 

Props brettshumaker, sabernhardt.
Fixes #46604.


git-svn-id: https://develop.svn.wordpress.org/trunk@58687 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-content/themes/twentyseventeen/inc/template-tags.php

@@ -149,16 +149,27 @@ function twentyseventeen_front_page_section( $partial = null, $id = 0 ) {
 		$twentyseventeencounter = $id;
 	}
 
+	// Only when in Customizer, use a placeholder for an empty panel.
+	$show_panel_placeholder = false;
+
 	global $post; // Modify the global post object before setting up post data.
 	if ( get_theme_mod( 'panel_' . $id ) ) {
 		$post = get_post( get_theme_mod( 'panel_' . $id ) );
 		setup_postdata( $post );
 		set_query_var( 'panel', $id );
 
-		get_template_part( 'template-parts/page/content', 'front-page-panels' );
+		if ( $post && in_array( $post->post_status, array( 'publish', 'private' ), true ) ) {
+			get_template_part( 'template-parts/page/content', 'front-page-panels' );
+		} elseif ( is_customize_preview() ) {
+			$show_panel_placeholder = true;
+		}
 
 		wp_reset_postdata();
 	} elseif ( is_customize_preview() ) {
+		$show_panel_placeholder = true;
+	}
+
+	if ( $show_panel_placeholder ) {
 		// The output placeholder anchor.
 		printf(
 			'<article class="panel-placeholder panel twentyseventeen-panel twentyseventeen-panel%1$s" id="panel%1$s">' .