return "no results found" instaed of an empty list when no results are found

src/couchapp/secreton/lists/index.js

@@ -47,6 +47,9 @@ function(head, req) {
 				item_in_col = 0;
 			}
 		}
+		if (!first_key){
+	        send( 'No results found');	
+    	}
 		var pagination = {};
 		if( limit ){
 			if( query_type =="is"){