Merge "Catch nullptr possibilities in MediaExtractor jni code" into udc-dev am: d63a1d16

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22555207



Change-Id: I62806ed80b13022e1828f180daa3eb893ebfd721
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>