Blacklist: fix NPE

getCallerInfo() can be null if the caller info is being
asynchronously read. Use a different method to get the phone number.

Change-Id: I4b77552a3e3cddd6d3fc9ba8e13721d7431f6141
telecom: fix ringtone NPE when profile is set to silent

If ringmode is set to SUPPRESS ringtone manager returns a null ringtone.
Note: to repro exception set profile to silent, then configure, click
on phone app group, and set ring mode to "off"

Change-Id: Iaa80a628d9d80f1741d5a4c736a34e0cbbe00685