Last modified: 2013-04-15 12:26:27 UTC
Currently, with the latest version of this extension, if you choose not to include a category, the extension places "[[Category:]]" - this behavior seems to vary when you are presented with an upload warning.
I almost forgot about this bug until the Bug Day email, it seems I can no longer reproduce this behavior. If one or more people would also like to confirm, this can just be resolved.