null file upload

[Angelo Chen]

Hi,

I have noticed some file upload that contains ':null', but I can not
re-produce this error in the development, say in a form, i try to
upload a big file, before it finish, I click other page, this will not
trigger the post action in the form, file will not be saved. but in
production, I see those ":null" files in the database, I do a check in
the client side to be sure that a file has been selected. any idea?

Angelo