Allow for a null list of BT devices

b/31015775

Change-Id: I4d2bdde69ef454bd65a2ea8b20ded4fe219eab15
(cherry picked from commit 64d9a084e49360976d3a73ab1a17d7dbaaee375c)
diff --git a/Settings/src/com/android/tv/settings/accessories/AddAccessoryPreferenceFragment.java b/Settings/src/com/android/tv/settings/accessories/AddAccessoryPreferenceFragment.java
index dac821d..229bcfe 100644
--- a/Settings/src/com/android/tv/settings/accessories/AddAccessoryPreferenceFragment.java
+++ b/Settings/src/com/android/tv/settings/accessories/AddAccessoryPreferenceFragment.java
@@ -60,6 +60,10 @@
             screen.removeAll();
         }
 
+        if (devices == null) {
+            return;
+        }
+
         // Add entries for the discovered Bluetooth devices
         for (BluetoothDevice bt : devices) {
             final Preference preference = new Preference(themedContext);