Fix information saved on migrated objects.

Author: Niklaus Johner

opengever/maintenance/scripts/repository_migration_analyse.py

@@ -937,8 +937,8 @@ def validate(self):
                 'new_position': operation['new_repo_pos'].position,
                 'old_title': operation['old_repo_pos'].title,
                 'new_title': operation['new_repo_pos'].title,
-                'old_description': operation['old_repo_pos'].title,
-                'new_description': operation['new_repo_pos'].title,
+                'old_description': operation['old_repo_pos'].description,
+                'new_description': operation['new_repo_pos'].description,
                 'new_parent_uid': operation['new_parent_uid'],
                 'merge_into': operation['merge_into'],
                 'new_position_parent_guid': operation['new_position_parent_guid'],