Merge "Catch nullptr possibilities in NuMediaExtractor" into udc-dev am: 05263be8 am: e4ebac5f

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/av/+/22554788



Change-Id: I3ec21a2d01a6f62c7297d2a5f1ee4749a80e093c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>