Fix missing Optional type
What does this merge request do and why?
Fix missing Optional type
Optional was dropped in 2966277f, but it was needed by 68625cb9.
How to set up and validate locally
Numbered steps to set up and validate the change are strongly suggested.
Merge request checklist
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Tests added for new functionality. If not, please raise an issue to follow up. -
Documentation added/updated, if needed.