REST API: Ensure string returned in WP_REST_Templates_Controller::get_wp_templates_author_text_field().

Adds a fail-safe to return an empty string should the `switch` ever fall through without returning.

Currently, `WP_REST_Templates_Controller::get_wp_templates_author_text_field()` is tightly coupled to `WP_REST_Templates_Controller::get_wp_templates_original_source_field()`. However, if the `$original_source` values change in either method, but not both, it is possible a `void` or `null` will be returned, rather than a `string`.

Follow-up to [57366].

Props antonvlasenko, hellofromTonya, debarghyabanerjee.
Fixes #61580.
Built from https://develop.svn.wordpress.org/trunk@58705


git-svn-id: http://core.svn.wordpress.org/trunk@58107 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/rest-api/endpoints/class-wp-rest-templates-controller.php

@@ -871,6 +871,9 @@ class WP_REST_Templates_Controller extends WP_REST_Controller {
 				}
 				return $author->get( 'display_name' );
 		}
+
+		// Fail-safe to return a string should the original source ever fall through.
+		return '';
 	}
 
 

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.7-alpha-58704';
+$wp_version = '6.7-alpha-58705';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.