[automerge] Use the thumbnail when full bitmap is null in PermissionActivity 2p: a38d32fa2e

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/providers/MediaProvider/+/16631561

Bug: 214199778
Change-Id: I156a7f742854c8573667f5a71efbaa4cc3fc8e04