[3.0] substx3g: fix leak on error

Backport of !6971 (merged).

added MRStatus::Reviewable label

approved this merge request

changed milestone to %3.0.22

added Component::Subtitles label

added MRStatus::Acceptable label and removed MRStatus::Reviewable label

added MRStatus::Accepted label and removed MRStatus::Acceptable label

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merged