When the last data in a DNS record is removed the server will remove the DNS record itself. While this is fine in CLI, it could cause some confusion in Web UI because subsequent add operations will fail because the DNS record is no longer there.

Steps to reproduce:
1. Open an existing DNS record in Web UI.
2. Delete all data.
3. Click Update.
4. Add new data.
5. Click Update, the operation will fail.

One option, in step #5 the UI will add the DNS record back so the user never notices the record deletion.

Another option, in step #3 the UI will notify the user that the record has been deleted and then redirect the user to the search page. The user will have to use the adder dialog to add the record again.