get_comments() can return int, so a few places need to check if the return value is traversable before passing what is assumed to be an array.

See #32444.


git-svn-id: https://develop.svn.wordpress.org/trunk@32600 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/default-widgets.php

@@ -1009,7 +1009,7 @@ class WP_Widget_Recent_Comments extends WP_Widget {
 		}
 
 		$output .= '<ul id="recentcomments">';
-		if ( $comments ) {
+		if ( is_array( $comments ) && $comments ) {
 			// Prime cache for associated posts. (Prime post term cache if we need it for permalinks.)
 			$post_ids = array_unique( wp_list_pluck( $comments, 'comment_post_ID' ) );
 			_prime_post_caches( $post_ids, strpos( get_option( 'permalink_structure' ), '%category%' ), false );