Merge "Don't send null data call list response" am: 22a9bec54c

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2090384

Change-Id: Ic5cfb7ff25e9c330b2deceabb241802c2bcb3e62
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

telephony/java/android/telephony/data/DataService.java

@@ -41,6 +41,7 @@ import com.android.telephony.Rlog;
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.List;
 import java.util.Objects;
 
@@ -351,7 +352,7 @@ public abstract class DataService extends Service {
         public void requestDataCallList(@NonNull DataServiceCallback callback) {
             // The default implementation is to return unsupported.
             callback.onRequestDataCallListComplete(DataServiceCallback.RESULT_ERROR_UNSUPPORTED,
-                    null);
+                    Collections.EMPTY_LIST);
         }
 
         private void registerForDataCallListChanged(IDataServiceCallback callback) {