Found another place where deleted user needs to be checked.
simplify system call and prevent command injection
Remove extra newline
Add tests
Null User is now passed the existing user id, if any.
Soft deleted users' name will be displayed. Users that don't exist in db
will display 'Deleted user'
Code compaction
Merge pull request #150 from zendesk/pswadi/handle-deleted-buddy

Found another place where deleted user needs to be checked.