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Ubooquity already has an option to hide empty folders. Check the "advanced" settings section.
It was part of the initial design I had in mind for Ubooquity. So I might add it in the future.
It's a bug introduced in 1.7.0.
It will be fixed in the next release.
It will be fixed in the next release.
Customer support service by UserEcho
Can't promise anything yet though.