Can not delete a persons middle name

[AJenbo]

In the web UI: The middle name filed will not be saved if it is empty. If a contact has gotten a middle name by mistake, the best thing one can do is put a white space as the middle name.

[Duane Hinnen (duanedesign)]

i can confirm this behavior.
Steps to reproduce:
1. Visit https://one.ubuntu.com/contacts/
2. Click 'Add A Contact' then add a contact with a First, Middle, and Last name
3. Save contact
3. Now iIn the webUI click 'edit contact' and delete the middle name
4. Save
5. The middle name is not removed

Expected Behavior:
Deleting the Middle Name in the WebUi removes it from the contact.

thank you,
duanedesign