fix: Calendar feed list doesn't display in IE

docs/changelog/7.x.x.txt

@@ -8,6 +8,9 @@
  - rfe: Added message to user search operation when user count exceeds 250.
    (Diona Kidd, Knowmad Technologies)
 
+7.4.15
+ - fix: Calendar feed list doesn't display in IE
+
 7.4.14
  - fix: CS posts won't allow new attachments after deleting an old one
  - fix: SSL redirection broken

lib/WebGUI/Asset/Wobject/Calendar.pm

@@ -489,7 +489,11 @@ sub getEditForm {
         for (var i = 0; i < cells.length; i++)
             row.appendChild(cells[i]);
         
-        table.appendChild(row);
+        var tbody = table.getElementsByTagName('tbody')[0];
+        if (tbody)
+            tbody.appendChild(row);
+        else
+            table.appendChild(row);
         FeedsManager.updateFeed(table.getAttribute("id"),rowId);
     }