File uploading: Optional fields?

[eluser]RobbieL[/eluser]
When using the file uploading class in CI, is it possible to to set a field to be optional, and not required, like you can with the validation class?

I have a multiform file uploader than is working a treat, apart from the fact that it keeps spitting out "You did not select a file" error. I'd like the user to have the option of how many files they upload.

Any feedback would be greatly appreciated ... I'm going bald over this.