Merge "[Telephony] Return if context is null when register TelephonyCallback" am: a805d39229 am: 51f11f9b0b am: aab9659d41

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1644386

Change-Id: Iee971b6fdac174392e75e1ae49ef09446faf1257

telephony/java/android/telephony/TelephonyManager.java

@@ -15100,6 +15100,11 @@ public class TelephonyManager {
      */
     public void registerTelephonyCallback(@NonNull @CallbackExecutor Executor executor,
             @NonNull TelephonyCallback callback) {
+
+        if (mContext == null) {
+            throw new IllegalStateException("telephony service is null.");
+        }
+
         if (executor == null || callback == null) {
             throw new IllegalArgumentException("TelephonyCallback and executor must be non-null");
         }