title: How to remove empty and null strings from QStringList?
body: <p>I have a <code>QStringList</code> and I need to clean some meaningless elements : the empty and the null strings.</p>
  
  <p>I could not find a <code>QStringList</code> shortcut function for that.<br>
  What is the simplest way to clean the empty/null strings ?</p>