Merge "[Telephony] checking if the delegate is null before calling." am: 04d04ca89d am: 548c9b5edf am: 218437e97f

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2015035

Change-Id: Iaace73b2c390981cb2ddd34d67ee7a4afb308127