Deleting a group from LDAP breaks space permissions

Steps to Reproduce:

1. Create LDAP directory with group and sync directory to Confluence
2. Add group to space permissions of any space
3. Delete group from LDAP and re-sync directory
4. Access <confluence_baseURL>/spaces/viewspacesummary.action?key=<spacekey>

Expected Results:
The group should be deleted from the permissions of the space.

Actual Results:
A stack trace is thrown on the page:

Notes:
This seems to be occurring because the rows relevant to the group are not removed from the spacepermissions table when the group is deleted: