Fix crash on connected devices settings

If disconnected bluetooth devices didn't exist in
recent devices, the index will return -1. Our condition
didn't check this situation, the IndexOutOfBoundsException
will throw when this case happens.

This CL adds the condition to check whether index is over
than or equal 0 to fix IndexOutOfBoundsException.

Bug: 173059077
Test: make -j42 RunSettingsRoboTests
Change-Id: Id93f4cb6bded83540045c5e8c21c6f6122a39fed

src/com/android/settings/connecteddevice/PreviouslyConnectedDevicePreferenceController.java

@@ -144,7 +144,7 @@ public class PreviouslyConnectedDevicePreferenceController extends BasePreferenc
 
     private void addPreference(int index, Preference preference) {
         if (preference instanceof BluetoothDevicePreference) {
-            if (mDevicesList.size() >= index) {
+            if (index >= 0 && mDevicesList.size() >= index) {
                 mDevicesList.add(index, preference);
             } else {
                 mDevicesList.add(preference);