decodebin3: Provide clear error message if no decoders present
If we don't do this we will end up with a more cryptic error message (not-linked error from some upstream component).
Fixes #3198 (closed)
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The migration is almost done, at least the rest should happen in the background. There are still a few technical difference between the old cluster and the new ones, and they are summarized in this issue. Please pay attention to the TL:DR at the end of the comment.
If we don't do this we will end up with a more cryptic error message (not-linked error from some upstream component).
Fixes #3198 (closed)