CUNY Academic Commons

When a new user joins CAC and goes to the "My Commons" page, that user will see tons of empty "group joined" activity items.

These are just some of the numerous examples on cdev:
http://cdev.gc.cuny.edu/wp-admin/network/admin.php?page=bp-activity&aid=248113&action=edit
http://cdev.gc.cuny.edu/wp-admin/network/admin.php?page=bp-activity&aid=224703&action=edit
http://cdev.gc.cuny.edu/wp-admin/network/admin.php?page=bp-activity&aid=224700&action=edit

The problem is because of older "group joined" activity items being recorded with the group ID of 0. The last instance of this was over a year ago with most of them being recorded between 4-5 years ago.

Boone - Since the empty activity group scope relies on group ID 0, I plan on changing the group scope arguments on CAC to check for some invalid query like 'component = -1'. Let me know if you're okay with this or if you'd rather solve this by deleting all the invalid "group joined" activity items.