Check if already unsubscribing when ice fails #1410
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Description
This PR fixes a race condition that could take place when a (multiplePC) stream fails while unsubscribing from it. In that case, the stream would stay marked as
failedand erizoClient would never allow subscribing to it again.[] It needs and includes Unit Tests
Changes in Client or Server public APIs
[] It includes documentation for these changes in
/doc.