module accidently deleting audio file

Take the use case where you edit an audio node and then reload the edit screen. This action will delete the existing audio file. This is due to the code:

// When you enter the edit view the first time we need to clear our files in
  // session for this node. This is so if you upload a file, then decide you
  // don't want it and reload the form (without posting), the files will be
  // discarded.
  if(count($_POST) == 0) {
    if (isset($_SESSION['audio_file'][$nid])) {
      // TODO: need to be able to delete unsaved temp files. the code below
      // won't work because you can't tell the difference between an uploaded
      // file and an "good" existing file.
      #file_delete($_SESSION['audio_file'][$nid]->filepath);
    }
    unset($_SESSION['audio_file'][$nid]);
  }

The idea is that if you created a node, uploaded a file, and decided you didn't want a refresh would get rid of the file.

I don't think this is a good way to go about it due to other use cases in this situation. A better way might be to provide a check box to delete the file similar to how they do it cck image node. Check the box if you want the file deleted once it's uploaded.

I have, also, found that if you just comment out this section of code it seems to work fine. If you want to replace the old file just upload a new one. If there is no audio file it won't let the node submit.