Bug 862061 - [SMS][MMS] contacts without a phone number entry will break the SMS app

Per request here https://bugzilla.mozilla.org/show_bug.cgi?id=862061#c12

The tests cannot be easily ported because they require mocks that don't exist in this v1.0.1 world and I was asked to keep it minimal.

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>