Merge "Check for null service in ScreenshotHelper" into rvc-dev am: 1e23e8e2 am: 500c9959 am: 29905ae3 am: c7a80a50

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/11852405

Change-Id: I92197e7e7edcfb1c5137f57c2d96b74b7dd82bb4