Fix uninitialized data use in MKV import. (introduced in r400)
Fix uninitialized data use in MKV import. (introduced in r400)

defaultDuration was set without being checked if it existed.


MaddTheSane/perian,MaddTheSane/perian,MaddTheSane/perian,MaddTheSane/perian,MaddTheSane/perian,MaddTheSane/perian