olly 62bdb1b93a Fix failure when a seek is performed with no enabled tracks
This issue affects ExtractorMediaSource only. We shouldn't
start loading in the case that we're prepared and have no
enabled tracks, since there's nothing that we need to load.
This was causing an assertion failure in startLoading.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=140030650
2016-11-25 20:18:32 +00:00
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2016-11-25 20:18:32 +00:00