Fix crashes related to finalizing the sink/media
The following discussion from !160 (merged) should be addressed:
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@bberg started a discussion: (+1 comment) All this does is log a message. And, if we don't implement it the default finalizer will still be called, which should fall over.
A backtrace of that crash would be interesting. We are also emitting a notification on the same
NULL
pointer apparently. So something fishy is going on here.