Fix no file in bulletin form

config/locales/new_ui.en.yml

@@ -31,6 +31,7 @@ en:
   no_app: No module
   no_category: No Available Category
   no_date: No date
+  no_file: No file
   previous: Previous
   remove: Remove
   remove_default: Remove default

vendor/built_in_modules/announcement/app/views/panel/announcement/back_end/bulletins/_form_file.html.erb

@@ -2,7 +2,11 @@
   <div class="fileupload fileupload-new start-line" data-provides="fileupload">
 <% else %>
   <div class="fileupload-exist start-line">
+    <% if form_file.file.blank? %>
+      <%= t(:no_file) %>
+    <% else %>
       <%= link_to form_file.file_identifier, form_file.file.url, {:class => 'file-link for_preview', :target => '_blank', :title => t(:view), "data-trigger" => :hover}.merge(file_picture_preview_setting(form_file.file.url)) %>
+    <% end %>
 <% end %>
   <div class="input-prepend input-append">
     <% if form_file.new_record? %>