Organize leaves empty parent directories behind

Say I have the following layout:

src/foo/configs/my.conf
src/foo/scripts/start-my-thing

And my YAML:

# [...]

parts:
    my-part:
        plugin: dump
        source: src/foo
        organize:
            configs/my.conf: my-conf-dir/my.conf
            scripts/start-my-thing: bin/start-my-thing

As things are now, the snap will contain an empty `configs` directory as well as an empty `scripts` directory, which need to be filtered out via the `stage`/`snap` keywords. This is probably something that can be fixed in the organize code (removing empty parent directories) instead of expecting the user to track it.