If you are asking for a way to detect whether a file has been uploaded using the form, then this is possible using a CSS workaround.

Try something like this:

[[image %%form_raw{image}%% class="img_%%form_raw{image}%%" alt=""]]

[[module CSS]]
.img_ {
    display:none;
}
[[/module]]

The image will only be displayed if something has been uploaded. I've used this extensively for my own projects in the past so I can verify that it works.

That was definitely a bug what happened… (the double post)