Unable to remove the XMPP, Email and Website details under contact manager once the details is filled and submitted.

Unable to remove the XMPP, Email and Website details under contact manager once the details is filled and submitted.

Find the below steps to reproduce the issue.

1. Go to Contact Manager and add an External/Private contact.
2. Once the form to add contact is opened, fill all the fields including XMPP, Email and Website details and save the entry.
3. Click on edit entry and remove the details filled in XMPP, Email and website fields and click on submit. You will get a pop-up saying field cannot be empty
4. If you click on delete XMPP, Delete Email and Delete Website buttons, it will not respond and you will not be able to save the data until you fill some values in these fields.