-if ( ! empty( $_REQUEST['s'] ) )
- printf( ' <span class="subtitle">' . __('Search results for “%s”') . '</span>', get_search_query() );
+
+if ( isset( $_REQUEST['s'] ) && strlen( $_REQUEST['s'] ) ) {
+ /* translators: %s: search keywords */
+ printf( ' <span class="subtitle">' . __( 'Search results for “%s”' ) . '</span>', get_search_query() );
+}