Ticket #40188: 40188.3.patch

src/wp-admin/includes/class-wp-comments-list-table.php

@@ -322 +322 @@
 ?>
                 <div class="alignleft actions">
 <?php
-                if ( 'top' === $which ) {
+                if ( 'top' === $which && $this->has_comments() ) {
 ?>
                         <label class="screen-reader-text" for="filter-by-comment-type"><?php _e( 'Filter by comment type' ); ?></label>
                         <select id="filter-by-comment-type" name="comment_type">
@@ -790 +790 @@
                  */
                 do_action( 'manage_comments_custom_column', $column_name, $comment->comment_ID );
         }
+
+        /**
+         * Tells if there is minimum one comment not in trash
+         */
+        protected function has_comments() {
+                $comments = get_comments( array(
+                        'number' => 1,
+                        ) );
+                if( $comments ) {
+                        return true;
+                } else {
+                        return false;
+                }
+        }
 }