Manipulate generated HTML

You can use a hook to edit the output. This way you can e.g. output a fallback text for an empty template.

Listen

function atkp_modify_output_list_callback( $output, $products, $template ) {

	return $output ;
}
add_filter( 'atkp_modify_output_list', 'atkp_modify_output_list_callback', 10, 3);

Products

function atkp_modify_output_product_callback( $output, $product, $template ) {

	return $output ;
}
add_filter( 'atkp_modify_output_product', 'atkp_modify_output_product_callback', 10, 3);

Search form

function atkp_modify_output_searchform_callback( $output, $template ) {

	return $output ;
}
add_filter( 'atkp_modify_output_searchform', 'atkp_modify_output_searchform_callback', 10, 2);