Bug: | None removes the Upload File button in OpenAPI schema docs

[peterschutt]

          May need to be a separate issue, but `| None` also removes the `Upload File` button in OpenAPI schema docs :(

from litestar import Controller, Litestar, post
from litestar.datastructures import UploadFile
from litestar.enums import RequestEncodingType
from litestar.params import Body


class Files(Controller):
    @post(path="/files/upload")
    async def upload_files(
        self,
        data: UploadFile | None = Body(media_type=RequestEncodingType.MULTI_PART),
    ) -> str:
        return data


app = Litestar(route_handlers=[Files])

Without | None

With | None

Originally posted by @JacobCoffee in #3407 (comment)

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