Dialer: Handle "Unknown" and null numbers when adding to blacklist.

JIRA: BACON-278
Change-Id: I819968e06387b2cf4ddd9e9d47fdf87b6099a98b
Automatic translation import

Change-Id: Ie9fac7e47b7eb94cf7cd04a60ea897788ff781e3
[3/3] Base: Incoming Call in Background
[2/2] Dialer: Disable Statusbar and Navbar during call by Proximity Sensor
Revert "Chinese Location Lookup [1/2] Dialer: Chinese Reverse Lookup"

This reverts commit 6605b6292df97b66785a06927d7bcd28c217d121.
[1/3] Dialer: Add Google Reverse Lookup
Dialer: Support 4.4.3
Dialer: Fix letters width