Don't update PO-specific notifications if not one

Can cause a crash if BOOT_COMPLETED is received before provisioning.

Bug: 26811719
Change-Id: I5edef01529b83c7a223d1d7fb788e8979da78c8e

Author: hex539

app/src/main/java/com/afwsamples/testdpc/DeviceAdminReceiver.java

@@ -276,6 +276,13 @@ public void onPasswordChanged(Context context, Intent intent) {
     private static void updatePasswordQualityNotification(Context context) {
         DevicePolicyManager devicePolicyManager = (DevicePolicyManager) context.getSystemService(
                 Context.DEVICE_POLICY_SERVICE);
+
+        if (!devicePolicyManager.isProfileOwnerApp(context.getPackageName())
+                && !devicePolicyManager.isDeviceOwnerApp(context.getPackageName())) {
+            // Only try to update the notification if we are a profile or device owner.
+            return;
+        }
+
         NotificationManager nm = (NotificationManager)
                 context.getSystemService(Context.NOTIFICATION_SERVICE);