Hide the recipientResults container if there is no input to search for

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>
Move mock navigator.mozContacts to own file

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>
Tests display of ThreadUI.recipientResults by ThreadUI.recipient.value

- has value, is not cleared or hidden
- no value, is cleared and hidden

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>