Backport of "gstinfo: Parse "NONE" as a valid level name" into 1.20
Backport of !2734 (merged) "gstinfo: Parse "NONE" as a valid level name".
Commits:
- dfea5070 gstinfo: Parse "NONE" as a valid level name
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Backport of !2734 (merged) "gstinfo: Parse "NONE" as a valid level name".
Commits: