Editor: Update util for scoping CSS selectors.

Adds early return for existing scope_selector method in preparation for extending block style variations.

Props aaronrobertshaw, audrasjb, isabel_brison.
Fixes #61120.

Built from https://develop.svn.wordpress.org/trunk@58245


git-svn-id: http://core.svn.wordpress.org/trunk@57708 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/class-wp-theme-json.php

@@ -1797,12 +1797,17 @@ class WP_Theme_JSON {
 	 * </code>
 	 *
 	 * @since 5.9.0
+	 * @since 6.6.0 Added early return if missing scope or selector.
 	 *
 	 * @param string $scope    Selector to scope to.
 	 * @param string $selector Original selector.
 	 * @return string Scoped selector.
 	 */
 	public static function scope_selector( $scope, $selector ) {
+		if ( ! $scope || ! $selector ) {
+			return $selector;
+		}
+
 		$scopes    = explode( ',', $scope );
 		$selectors = explode( ',', $selector );
 

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.6-alpha-58244';
+$wp_version = '6.6-alpha-58245';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.