[patch] crash in ogg encoder when only transcoding audio

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Hello.

When transcoding with only an audio stream, transcode-1.1.5 will crash
in the ogg exporter.

reproducer:

transcode -i ~/Blossom.wav -a 0 -y null,ogg -m /tmp/track1.ogg

I believe the attached patch will fix the problem.

/David

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