Coding Standards: Remove extra check in WP_REST_Server::get_json_last_error().

`json_last_error()` can only return an integer, and the `JSON_ERROR_NONE` constant has the value of `0`, so the `empty()` check is redundant here.

Follow-up to [34928], [46206].

Props dilipbheda, audrasjb, SergeyBiryukov.
See #63249.
Built from https://develop.svn.wordpress.org/trunk@60151


git-svn-id: http://core.svn.wordpress.org/trunk@59487 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/rest-api/class-wp-rest-server.php

@@ -1339,9 +1339,7 @@ class WP_REST_Server {
 	 * @return false|string Boolean false or string error message.
 	 */
 	protected function get_json_last_error() {
-		$last_error_code = json_last_error();
-
-		if ( JSON_ERROR_NONE === $last_error_code || empty( $last_error_code ) ) {
+		if ( JSON_ERROR_NONE === json_last_error() ) {
 			return false;
 		}
 

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.9-alpha-60150';
+$wp_version = '6.9-alpha-60151';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.