Unknown contacts are missing "up" affordance on contact card

- Contacts without a name cause the ContactDetailActivity to have
a blank title and therefore no "up" affordance.

- Use "(no name)" instead of blank or "(Unknown)" and make it
consistent across contact card, contact list, contact tile adapter,
and quick contacts

- Fix NPE when adding social widget for contact with no display
name

Bug: 5061950
Bug: 5096795
Change-Id: Id242e0f6d8bfe835d44be448129fddadd146fdb6