fix parse_report.py for missing orders

Author: merszym

CHANGELOG.md

@@ -5,6 +5,11 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
+## [Unreleased]
+### Changed
+
+- fix the parse_report.py script to account for cases where krakenuniq assigned a taxa without order 
+
 ## [v1.6.1] - 2023-07-04
 
 This is a minor update to the final_report created

bin/parse_report.py

@@ -38,7 +38,7 @@ def order(self):
         if self.level == 'order':
             return self.name
         else:
-            return self.parent.order
+            return self.parent.order if self.parent else None
 
     @property
     def best_child(self):