mediacodec: Don't crash if trying to open a codec that does not exist
mediacodec: Don't crash if trying to open a codec that does not exist

Change-Id: If75e3156517993629f50622a84a9ac573fced815

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