Unable to remove taxonomy with nested terms

[MikeAlhayek]

Describe the bug

If we have a taxonomy with nested terms, trying to remove a child node will not work.

Orchard Core version

2.0.0-previews

To Reproduce

Steps to reproduce the behavior:

1. Create a taxonomy item
2. add nested items to look like this

• A
• B
  • 1
  • 2
    • I
    • II
    • III
  • 3
• C

3. Try removing the III item, you'll get a success message but nothing gets removed.

Expected behavior

I expect the item to be removed.

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