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