title: Missing nodes cause a null exception crash linq to xml
body: <p>I get a null exception on this because MYTAG1 doesn't exist.  I understand that this is because Element("MYTAG1") is null and calling Elements("MYTAG2") on it wont work.</p>
  
  <p>How do I deal with this to prevent the crash?</p>
  
  <pre><code>     var myItems = from myNode in Nodes.Element("MYTAG1").Elements("MYTAG2")
                             select new EPTableItem
                             {
                             //    Assign stuff here                            
                             };
  </code></pre>