Merge "Diagnosing when only SysUI is visible." into sc-v2-dev

            if (hasSystemUiObject("keyguard_status_view")) return "Phone is locked";

            final String visibleApps = mDevice.findObjects(getAnyObjectSelector())

                    .stream()

                    .map(LauncherInstrumentation::getApplicationPackageSafe)

                    .distinct()

                    .filter(pkg -> pkg != null)

                    .collect(Collectors.joining(","));

            if (SYSTEMUI_PACKAGE.equals(visibleApps)) return "Only System UI views are visible";

            if (!mDevice.wait(Until.hasObject(getAnyObjectSelector()), WAIT_TIME_MS)) {

                return "Screen is empty";

            }