bluetooth: Check if device name is null before trying to convert

device/bluetooth/test/bluetooth_test.h

Index: device/bluetooth/test/bluetooth_test.h
diff --git a/device/bluetooth/test/bluetooth_test.h b/device/bluetooth/test/bluetooth_test.h
index 06c3f4af1229122302ffabc4ed9130e8a2c625f5..a4f28a717c34d26b4a9fe6ed369f4c52ba521125 100644
--- a/device/bluetooth/test/bluetooth_test.h
+++ b/device/bluetooth/test/bluetooth_test.h
@@ -96,6 +96,8 @@ class BluetoothTestBase : public testing::Test {
   //      kTestDeviceAddress1.
   //   4: kTestDeviceNameEmpty with no advertised UUIDs and address
   //      kTestDeviceAddress2.
+  //   5: Device with no name, with no advertised UUIDs and address
+  //      kTestDeviceAddress1.
   virtual BluetoothDevice* DiscoverLowEnergyDevice(int device_ordinal);
 
   // Simulates success of implementation details of CreateGattConnection.