Check for valid phone account before displaying voicemail TOS

Project Fi devices crash when declining voicemail TOS because
of an invalid PhoneAccountHandle.  This cl fixes the problem by
not showing the TOS when the PhoneAccountHandle is not valid.

Bug: 67001886,66969838
Test: manual and updated unit tests
PiperOrigin-RevId: 170418189
Change-Id: I36dd0b10ab7468b0937a81f3f0427a4d64091955
1 file changed
tree: 082da9fb098a96aac9665310bc7aea9cc9301e14
  1. assets/
  2. java/
  3. Android.mk
  4. AndroidManifest.xml
  5. CONTRIBUTING
  6. LICENSE