Themes: Do not show an update button if there's no update package.

This updates the list view to match the existing behaviour in the single theme modal.

Props tristangemus for initial patch.
Fixes #37774.
Built from https://develop.svn.wordpress.org/trunk@38788


git-svn-id: http://core.svn.wordpress.org/trunk@38731 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/theme.php

@@ -572,6 +572,7 @@ function wp_prepare_themes_for_js( $themes = null ) {
 			'parent'       => $parent,
 			'active'       => $slug === $current_theme,
 			'hasUpdate'    => isset( $updates[ $slug ] ),
+			'hasPackage'   => isset( $updates[ $slug ] ) && ! empty( $updates[ $slug ][ 'package' ] ),
 			'update'       => get_theme_update_available( $theme ),
 			'actions'      => array(
 				'activate' => current_user_can( 'switch_themes' ) ? wp_nonce_url( admin_url( 'themes.php?action=activate&stylesheet=' . $encoded_slug ), 'switch-theme_' . $slug ) : null,

wp-admin/themes.php

@@ -378,7 +378,11 @@ $can_install = current_user_can( 'install_themes' );
 	<# } #>
 
 	<# if ( data.hasUpdate ) { #>
-		<div class="update-message notice inline notice-warning notice-alt"><p><?php _e( 'New version available. <button class="button-link" type="button">Update now</button>' ); ?></p></div>
+		<# if ( data.hasPackage ) { #>
+			<div class="update-message notice inline notice-warning notice-alt"><p><?php _e( 'New version available. <button class="button-link" type="button">Update now</button>' ); ?></p></div>
+		<# } else { #>
+			<div class="update-message notice inline notice-warning notice-alt"><p><?php _e( 'New version available.' ); ?></p></div>
+		<# } #>
 	<# } #>
 
 	<span class="more-details" id="{{ data.id }}-action"><?php _e( 'Theme Details' ); ?></span>

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.7-alpha-38787';
+$wp_version = '4.7-alpha-38788';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.