Prevent NPEs in NLSes

NLSs (rightly) assume that the SBN they get from
onNotification[X] calls will not be null. If it is, log and bail early.

Bug: 78279961
Test: reboot device
Change-Id: Id2bba6b15aeea2d701d92d6c63022463f0f8c1df
diff --git a/core/java/android/service/notification/NotificationAssistantService.java b/core/java/android/service/notification/NotificationAssistantService.java
index 12d3228..da40254 100644
--- a/core/java/android/service/notification/NotificationAssistantService.java
+++ b/core/java/android/service/notification/NotificationAssistantService.java
@@ -293,6 +293,11 @@
                 Log.w(TAG, "onNotificationEnqueued: Error receiving StatusBarNotification", e);
                 return;
             }
+            if (sbn == null) {
+                Log.w(TAG, "onNotificationEnqueuedWithChannel: "
+                        + "Error receiving StatusBarNotification");
+                return;
+            }
 
             SomeArgs args = SomeArgs.obtain();
             args.arg1 = sbn;
@@ -311,6 +316,10 @@
                 Log.w(TAG, "onNotificationSnoozed: Error receiving StatusBarNotification", e);
                 return;
             }
+            if (sbn == null) {
+                Log.w(TAG, "onNotificationSnoozed: Error receiving StatusBarNotification");
+                return;
+            }
 
             SomeArgs args = SomeArgs.obtain();
             args.arg1 = sbn;
diff --git a/core/java/android/service/notification/NotificationListenerService.java b/core/java/android/service/notification/NotificationListenerService.java
index b44c9d5..78e30ab 100644
--- a/core/java/android/service/notification/NotificationListenerService.java
+++ b/core/java/android/service/notification/NotificationListenerService.java
@@ -1272,6 +1272,10 @@
                 Log.w(TAG, "onNotificationPosted: Error receiving StatusBarNotification", e);
                 return;
             }
+            if (sbn == null) {
+                Log.w(TAG, "onNotificationPosted: Error receiving StatusBarNotification");
+                return;
+            }
 
             try {
                 // convert icon metadata to legacy format for older clients
@@ -1313,6 +1317,10 @@
                 Log.w(TAG, "onNotificationRemoved: Error receiving StatusBarNotification", e);
                 return;
             }
+            if (sbn == null) {
+                Log.w(TAG, "onNotificationRemoved: Error receiving StatusBarNotification");
+                return;
+            }
             // protect subclass from concurrent modifications of (@link mNotificationKeys}.
             synchronized (mLock) {
                 applyUpdateLocked(update);