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cf. the thread referenced by the URL field; A file upload field with no file selected can still be considered "successfull" in HTML 4 terms and UAs are free to submit the field (even if it contains no value/data). Konq 2.x, in particular, seems to have implemented it this way. Since we prefer the uploaded_file parameter to the uri parameter if both are present, this makes all non-upload submissions from Konq fail. Possible resolution is to check whether the uploaded file actually contains any data and fall back on any URI if one was given.
This is addressed by the TAG-imposed ban on POST-ed forms. Resolving WONTFIX.