MidiDeviceInfo: Fix NPE for devices with no port names
MidiDeviceInfo: Fix NPE for devices with no port names

Change-Id: I703709f84b6b1951b67918c9762bb84a142d855c

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base