Backport of "mxfvanc: Handle empty ANC essence" into 1.18
Backport of !2345 (merged) "mxfvanc: Handle empty ANC essence".
Commits:
- 162e7bd2 mxfvanc: Handle empty ANC essence
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Backport of !2345 (merged) "mxfvanc: Handle empty ANC essence".
Commits: