Merge "Address crash if no tokens which allow BAL present" into udc-dev am: 83847ed497 am: dd8d1dc4be

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23389159

Change-Id: Ic2bf0d146496438840622157e6f59bf795a3eafb
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

services/core/java/com/android/server/wm/BackgroundLaunchProcessController.java

@@ -190,6 +190,11 @@ class BackgroundLaunchProcessController {
                 return false;
             }
             List<IBinder> binderTokens = getOriginatingTokensThatAllowBal();
+            if (binderTokens.isEmpty()) {
+                // no tokens to allow anything
+                return false;
+            }
+
             // The callback will decide.
             return mBackgroundActivityStartCallback.isActivityStartAllowed(
                     binderTokens, uid, packageName);