Avoid UnsupportedOperationException from getDefaultSmsSubscriptionId()

This is basically reverting to earlier behavior.

Test: basic sanity
Bug: 134375393
Change-Id: I44dc66f9f3d5d4dfcab95220d7a6a6be0ed5a825

telephony/java/android/telephony/SmsManager.java

@@ -1975,9 +1975,11 @@ public final class SmsManager {
      */
     public static int getDefaultSmsSubscriptionId() {
         try {
-            return getISmsServiceOrThrow().getPreferredSmsSubscription();
+            return getISmsService().getPreferredSmsSubscription();
         } catch (RemoteException e) {
             return SubscriptionManager.INVALID_SUBSCRIPTION_ID;
+        } catch (NullPointerException e) {
+            return SubscriptionManager.INVALID_SUBSCRIPTION_ID;
         }
     }