Null check during filtering itemInfo by itemType.

Java crash says theres NPE on an itemType on null object reference implying itemInfo is null.

bug: 416662647
Test: presubmit
Flag: EXEMPT crash fix
Change-Id: I3c9724964442435148a720e96f208bd7c2a19ad5

quickstep/src/com/android/launcher3/model/PredictionUpdateTask.java

@@ -72,7 +72,8 @@ public class PredictionUpdateTask implements ModelUpdateTask {
 
         Set<UserHandle> usersForChangedShortcuts =
                 dataModel.itemsIdMap.getPredictedContents(mPredictorState.containerId).stream()
-                        .filter(info -> info.itemType == ITEM_TYPE_DEEP_SHORTCUT)
+                        .filter(info -> info != null &&
+                                info.itemType == ITEM_TYPE_DEEP_SHORTCUT)
                         .map(info -> info.user)
                         .collect(Collectors.toSet());