Fix NPE when try to process call redirection requests. am: d037c269

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/services/Telecomm/+/19518872



Change-Id: I441f8fb22b43fcf8881c0efc1a297ee07213a390
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>