NPE protect AdapterService.getRemoteName()

Added an if statement to protect against null pointer exceptions
that could occur if mRemoteDevices is null. This is a bandaid
fix as the reason that this is happening is because
BleOnProcessStart() has yet to be called and this can cause
problems in the future.

Bug: 21893759
Change-Id: I20bc25cd7f1e48931b51c0ed9fa1120401f04784