title: PySide2 + QML : QApplication: invalid style override passed, ignoring it
body: <p>I'm building a simple app using QML + PySide / Python as backend.</p>
  
  <p>I'm trying to use "Universal" qml style. I'm subclassing QApplication and adding <code>-style Universal</code> argument : </p>
  
  <pre><code>class MyApp(QApplication):
  
  def __init__(self, args):
  
      qt_args = [args[0], '-style', 'Universal'] + args[1:]
      super(MyApp, self).__init__(qt_args)
  </code></pre>
  
  <p>It works (my app uses Universal style) but it throws the following warning:</p>
  
  <pre><code>QApplication: invalid style override passed, ignoring it.
  Available styles: windowsvista, Windows, Fusion
  </code></pre>
  
  <p>It seems that PySide2 has troubles getting the standard QML styles (Universal / Material)</p>
  
  <p>Does anyone know how to deal with it?</p>
  
  <p>Thanks.</p>