Fix bug.

app/views/admin/announcements/_form_image.html.erb

@@ -3,7 +3,7 @@
   <div class="control-group">
     <label class="control-label muted"><%= t(:image) %></label>
     <div class="controls">
-      <div class="fileupload fileupload-new clearfix <%= 'fileupload-edit' if @bulletin.image.file %>" data-provides="fileupload">
+      <div class="fileupload fileupload-new clearfix <%= 'fileupload-edit' if form_image.file.present? %>" data-provides="fileupload">
         <div class="fileupload-new thumbnail pull-left">
           <% if form_image.file.file %>
             <%= image_tag form_image.file %>