FontAwesome tags removed when switching between Source and Wysiwyg I am using http://fortawesome.github.com/Font-Awesome/ - popular iconic font

When I insert "i" tag i.e.  it is saved only in source mode enabled, but removed from html when saving in wysiwyg mode.

How to avoid removing i tag? (using Ckeditor with Drupal 7 and Wysiwyg module)
As Vic Nicethemer pointed out - the solution (for me) was to add &amp;nbsp; within the &lt;i&gt; and &lt;/i&gt; like so: &lt;i class="icon-facebook"&gt;&amp;nbsp;&lt;/i&gt;.

CKEDitor removes elements that do not have any internal content...