Glossary: Linking exists after deleting glossary

Glossary entries seem to persist(and by extension the linking) even after deleting the associated glossary resource.

Steps to reproduce:

1. Confirm glossary auto linking is enabled in Site Administration -> Filters -> Manage Filters
2. Create a global glossary with the following description: "Testing is good"
3. Create a label with "Testing is good"
4. Create an entry in this glossary with "good" as the keyword and set autolinking to true
5. Confirm the linking was established to the description(in #2) and label (in #3)
6. Go to the course page and delete the glossary(from #2, NOT the entry itself)
7. The linking still exists to label(in #3) with the on hover still showing a ref to the deleted glossary
   
   and on click showing a "Activity deletion in progress" error message