title: Check for an empty string
body: <p>I have a little question. Seems easy but I don't get it working.
  All I want is check if a string is empty or not. Here's what I have so far:</p>
  
  <pre><code>if(mystring.text != @""){
      myPath = [myPath stringByAppendingString:mystring.text];
  }
  </code></pre>