title: How to use Jasny Fileupload in update/edit operation? This is letting field in blank when user don't change image
body: <p>I'm using <a href="http://jasny.github.com/bootstrap/javascript.html#fileupload" rel="nofollow">Jasny Fileupload</a> to add and update some images, everything works fine when user add a new image, but when user will update images and don't change the image, the image reference is sent in blank.</p>
  
  <p>I would like to know what I'm doing wrong or how to preserve the image name when user don't change anything?</p>
  
  <p>Tks</p>
  
  <p>Below it follows:</p>
  
  <pre><code>&lt;div class="control-group"&gt;
    &lt;label class="control-label" for=""&gt;Foto 1-1 (432x254px):&lt;/label&gt;
    &lt;div class="controls"&gt;
    &lt;div class="fileupload fileupload-exists" data-provides="fileupload"&gt;
    &lt;div class="fileupload-preview fileupload-exists thumbnail" style="max-width: 200px; max-height: 150px; line-height: 20px;"&gt;&lt;img src="http://localhost/Figoli-Ravecca/backoffice/user_data/&lt;?php echo mysql_result($result,0,"f_1_1_c"); ?&gt;" /&gt;&lt;/div&gt;
    &lt;div&gt;      
    &lt;span class="btn btn-file"&gt;&lt;span class="fileupload-exists"&gt;Change&lt;/span&gt;&lt;input type="file"  name="files[2]" /&gt;&lt;/span&gt;
    &lt;a href="#" class="btn fileupload-exists" data-dismiss="fileupload"&gt;Remove&lt;/a&gt;
    &lt;/div&gt; 
    &lt;/div&gt;
    &lt;/div&gt;
  &lt;/div&gt;
  </code></pre>