kwiberg 98cc88c873 Correctly handle the error case where the CodecId has a negative value
Negative values should be treated the same as too-large positive values: by returning an empty Maybe.

TBR=henrik.lundin@webrtc.org

Review URL: https://codereview.webrtc.org/1407383010

Cr-Commit-Position: refs/heads/master@{#10509}
2015-11-04 17:56:22 +00:00
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