title: C++ Qt return empty QString
body: <p>I made a function which returns a <code>QString</code>. At some points in my function it should return an empty <code>QString</code>.</p>
  
  <p>Just returning <code>""</code> doesn't work. When I use <a href="http://doc.qt.io/qt-4.8/qstring.html#isEmpty" rel="noreferrer"><code>QString::isEmpty()</code></a> it's not.
  My "emergency plan" was to return an "empty" string and check with it whether the text is "empty". But I don't think that's good style.</p>
  
  <p>So how do I return an empty <code>QString</code>?</p>