Fix blocked notifications screen

Don't filter out apps have don't have any usage events -
the package's notifications are still blocked

Test: atest, and verify that the packages match the 'blocked
count' subtext on the previous screen on an affected device
Fixes: 158343184

Change-Id: Iac01708849e3ae0b82f97db679ce512fc9675a17

src/com/android/settings/applications/AppStateNotificationBridge.java

@@ -84,6 +84,9 @@ public class AppStateNotificationBridge extends AppStateBaseBridge {
         for (AppEntry entry : apps) {
             NotificationsSentState stats =
                     map.get(getKey(UserHandle.getUserId(entry.info.uid), entry.info.packageName));
+            if (stats == null) {
+                stats = new NotificationsSentState();
+            }
             calculateAvgSentCounts(stats);
             addBlockStatus(entry, stats);
             entry.extraInfo = stats;