Ticket #50815: 50815.patch

src/wp-admin/includes/class-wp-ms-sites-list-table.php

@@ -333 +333 @@
                          */
                         do_action( 'restrict_manage_sites', $which );
                         $output = ob_get_clean();
-                        if ( ! empty( $output ) ) {
+                        
+                        if ( $this->has_items() ) {
                                 echo $output;
                                 submit_button( __( 'Filter' ), '', 'filter_action', false, array( 'id' => 'site-query-submit' ) );
                         }

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

@@ -560 +560 @@
 
                         $output = ob_get_clean();
 
-                        if ( ! empty( $output ) ) {
+                        if ( $this->has_items() ) {
                                 echo $output;
                                 submit_button( __( 'Filter' ), '', 'filter_action', false, array( 'id' => 'post-query-submit' ) );
                         }