Sitemaps: Check the result of `get_term_link()` when collecting the URLs in `WP_Sitemaps_Taxonomies::get_url_list()`.

This avoids a PHP warning during sitemap generation if `get_term_link()` returns an error, e.g. due to term ID being shared between multiple taxonomies.

Additionally, pass the `$taxonomy` argument to `get_term_link()` to properly disambiguate the call.

Props dd32.
Fixes #51416.
Built from https://develop.svn.wordpress.org/trunk@49137


git-svn-id: http://core.svn.wordpress.org/trunk@48899 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/sitemaps/providers/class-wp-sitemaps-taxonomies.php

@@ -99,8 +99,14 @@ class WP_Sitemaps_Taxonomies extends WP_Sitemaps_Provider {
 
 		if ( ! empty( $taxonomy_terms->terms ) ) {
 			foreach ( $taxonomy_terms->terms as $term ) {
+				$term_link = get_term_link( $term, $taxonomy );
+
+				if ( is_wp_error( $term_link ) ) {
+					continue;
+				}
+
 				$sitemap_entry = array(
-					'loc' => get_term_link( $term ),
+					'loc' => $term_link,
 				);
 
 				/**

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.6-alpha-49136';
+$wp_version = '5.6-alpha-49137';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.