fix broken js when there's no failed downloads

gui/slick/js/failedDownloads.js

@@ -22,6 +22,7 @@ $(document).ready(function(){
         });
     });
 
+    if($('.removeCheck').length){
         $('.removeCheck').forEach(function(name) {
             var lastCheck = null;
             $(name).click(function(event) {
@@ -44,4 +45,6 @@ $(document).ready(function(){
                 });
             });
         });
+    }
+
 });

gui/slick/views/manage_failedDownloads.mako

@@ -47,7 +47,6 @@
   </tfoot>
   <tbody>
 % for hItem in failedResults:
-<% curRemove  = "<input type=\"checkbox\" class=\"removeCheck\" id=\"remove-"+hItem["release"]+"\" />" %>
   <tr>
     <td class="nowrap">${hItem["release"]}</td>
     <td align="center">
@@ -65,7 +64,7 @@
         <img src="${srRoot}/images/providers/missing.png" width="16" height="16" alt="missing provider" title="missing provider"/>
     % endif
     </td>
-    <td align="center">${curRemove}</td>
+    <td align="center"><input type="checkbox" class="removeCheck" id="remove-${hItem["release"]}" /></td>
   </tr>
 % endfor
   </tbody>