[nearby] Catches NPE in ChreDiscoveryProvider

Test: -m
Ignore-AOSP-First: neary not in aosp yet
Fix: 298597342
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:5d07eee4c1671a3d1d6b6669c338d098cfe488f9)
Merged-In: I1ef411aea6db6d0c169aa08c303f4234c77baed9
Change-Id: I1ef411aea6db6d0c169aa08c303f4234c77baed9
2 files changed