title: .Trim() when string is empty or null
body: <p>I'm receiving some data from the client in the form of json.
  I'm writing this:</p>
  
  <pre><code>string TheText; // or whould it be better string TheText = ""; ?
  TheText = ((serializer.ConvertToType&lt;string&gt;(dictionary["TheText"])).Trim());
  </code></pre>
  
  <p>If the variable that's being parsed from json comes back empty, does this code crash when I call the .Trim() method?</p>
  
  <p>Thanks.</p>