id	summary	reporter	owner	description	type	status	priority	milestone	component	version	severity	resolution	keywords	cc
19205	Orphaned categories can be created by accident	dzver		"There are two ways to do that.

1. You can work on category tree from two browser windows. 
- In window one, delete a category
- In window two, add a child to the category that has been deleted.

wp_insert_term needs to check if the parent exists.

2. If you delete a couple of categories with bulk-delete, a third level child node can become orphan.

wp_delete_term uses get_term to find the parent node and can retrieve cached data."	defect (bug)	new	normal	Awaiting Review	Taxonomy		minor