Merge "Use empty string instead of nullable for leak report email" into...

Merge "Use empty string instead of nullable for leak report email" into udc-dev am: 3b0d3685 am: c7fb8b6b am: 5d9016ff

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23067598



Change-Id: I653b980a6034251539895418c139d93724477c44
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>