Merge "Nullability check for fts module" am: 5ae243b7f9 am: 382db17248

Original change: https://android-review.googlesource.com/c/platform/bionic/+/2490968

Change-Id: I9cf00d46a450e21a083eada763ce52964beef440
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>