Thread is already subscribed to after subscribing to a category, adding a thread, and deleting the category

• Type: Regression Bug
• Status: Closed
• Resolution: Won't Fix
• Affects Version/s: 7.0.0 M3
• Fix Version/s: 7.0.0 M3
• Component/s: Subscription Manager, ~ [Archived] Collaboration
• Labels: None
• Fix Priority: 4

Steps to reproduce:
1. Add Page with Message boards portlet
2. Add Category, subscribe to category
3. Add Thread to Category
4. Delete Category, make sure thread is deleted.
5. Go back to Message boards page, add thread

Expected result:
User is not subscribed to thread.

Actual result:
User is already subscribed to thread.