Return null when profile is not accessible in launcher api

Test: atest com.android.cts.devicepolicy.LauncherAppsProfileTest#testGetActivitiesWithProfile
Bug: 122264345
Change-Id: I25955fe3e602123c5f8fcb5a43305a1c2dd03bb5
diff --git a/services/core/java/com/android/server/pm/LauncherAppsService.java b/services/core/java/com/android/server/pm/LauncherAppsService.java
index 7f1fb6c..aa9bc26 100644
--- a/services/core/java/com/android/server/pm/LauncherAppsService.java
+++ b/services/core/java/com/android/server/pm/LauncherAppsService.java
@@ -313,6 +313,10 @@
                     Settings.Global.SHOW_HIDDEN_LAUNCHER_ICON_APPS_ENABLED, 1) == 0) {
                 return launcherActivities;
             }
+            if (launcherActivities == null) {
+                // Cannot access profile, so we don't even return any hidden apps.
+                return null;
+            }
 
             final int callingUid = injectBinderCallingUid();
             final ArrayList<ResolveInfo> result = new ArrayList<>(launcherActivities.getList());