Destroyed components with queued tasks can change next components' actionbars

[dianabarsan]

To replicate:

1. Login as an admin.
2. Navigate to contacts, check that there is a button to add a new district hospital in the LHS actionbar.
3. Go to messages
4. Write a script that creates and then deletes a bunch of docs. It doesn't matter what they are.
5. While your script is deleting docs, navigate to contacts.
6. Notice that there is no button to add a new district hospital in the LHS actionbar.

Not surprisingly, clicking "export" will download messages, not contacts.