Advanced Search to Taxonomy Archive

I am using WordPress 3.4.1 & Shopp 1.2.3.

So I have an advanced search (https://lordsnet.staging.wpengine.com/inventory/) where I am allowing the user to search by custom taxonomies with a keyword search. However, if the user selects only the custom taxonomies with no keyword, the results render no results.

So if you select a manufacturer and a category and click search you get no results (URL: https://lordsnet.staging.wpengine.com/?shopp_manufacturer=lucent&shopp_machine_family=0&shopp_category=forwarding-media&s=&pw-search=advanced-search&s_cs=true) because the search query var is empty. {Note to see wp_query, add &debug to the end (https://lordsnet.staging.wpengine.com/?shopp_manufacturer=lucent&shopp_machine_family=0&shopp_category=forwarding-media&s=&pw-search=advanced-search&s_cs=true&debug).}

However, what I would like is for the results in this scenario is to switch from is_search to an is_tax, where the page that displays is the equivalent to removing s=, pw-search=, and s_cs=, so that the resulting URL is https://lordsnet.staging.wpengine.com/?shopp_manufacturer=lucent&shopp_machine_family=0&shopp_category=forwarding-media

I then modified the parse_query:

add_action( 'parse_query', 'lordsnet_empty_search', 999 );
function lordsnet_empty_search( &$query ) {
	if ( isset( $_GET['pw-search'] ) && isset( $_GET['s'] ) && empty( $_GET['s'] ) && $query->is_main_query() ) {
		// Remove Search query
		unset( $query->query['s'] );
		unset( $query->query_vars['s'] );

		// Remove Shopp Search query
		unset( $query->query['s_cs'] );
		unset( $query->query_vars['s_cs'] );

		$query->is_search = false;
		$query->shopp_page = true;
	}
	return $query;
}

This basically says, from my understanding, that I removed the search and the Shopp search query vars from the query. Then I noticed that the queried object was wrong. So I changed it to this:

add_action( 'parse_query', 'lordsnet_empty_search', 999 );
function lordsnet_empty_search( &$query ) {
	if ( isset( $_GET['pw-search'] ) && isset( $_GET['s'] ) && empty( $_GET['s'] ) && $query->is_main_query() ) {
		// Remove Search query
		unset( $query->query['s'] );
		unset( $query->query_vars['s'] );

		// Remove Shopp Search query
		unset( $query->query['s_cs'] );
		unset( $query->query_vars['s_cs'] );

		$query->is_search = false;
		$query->shopp_page = true;

		unset( $query->queried_object );
		$query->queried_object = $query->get_queried_object();
	}
	return $query;
}

Doing this makes the main query the same on both URLs(https://lordsnet.staging.wpengine.com/?shopp_manufacturer=lucent&shopp_machine_family=0&shopp_category=forwarding-media&debug && https://lordsnet.staging.wpengine.com/?shopp_manufacturer=lucent&shopp_machine_family=0&shopp_category=forwarding-media&s=&pw-search=advanced-search&s_cs=true&debug), but what is being displayed is not correct.