Install: Prevent DB errors caused by web fonts API.

Bypass checking `theme.json` for web fonts during the installation of WordPress.

During installation the active theme is considered to be Twenty Twenty-Two (the default theme). As a block theme this prompts a database call when the web fonts API checks the `theme.json` settings, this triggers a database error during installation as the database tables do not exist.

Props chouby, costdev, peterwilsoncc, sergeybiryukov.
Fixes #55632.


Built from https://develop.svn.wordpress.org/trunk@53306


git-svn-id: http://core.svn.wordpress.org/trunk@52895 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/script-loader.php

@@ -3057,6 +3057,11 @@ function wp_enqueue_block_style( $block_name, $args ) {
  * @access private
  */
 function _wp_theme_json_webfonts_handler() {
+	// Block themes are unavailable during installation.
+	if ( wp_installing() ) {
+		return;
+	}
+
 	// Webfonts to be processed.
 	$registered_webfonts = array();
 

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.0-beta3-53305';
+$wp_version = '6.0-beta3-53306';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.