fixed previous commit by writing javascript not in python

parts/static/script.js

@@ -220,9 +220,9 @@ function show_part_info(partID) {
 
 function update_url(partID){
 	params = {}
-	var query = $('.search-bar').val();
+	// If there is a seach bar, take its content
-	if(len(query)>0){
+	if($('.search-bar').length){
-		params['q'] = query
+		params['q'] = $('.search-bar').val();
 	}
 	if(partID != 0){
 		params['p'] = partID