WebviewWidget: Handling Esc key, parent is sometimes overriden

... and no longer a callable Qt property.

Author: kernc

Orange/widgets/utils/webview.py

@@ -60,7 +60,7 @@ def hideWindow(self):
         while isinstance(w, QWidget):
             if w.windowFlags() & (Qt.Window | Qt.Dialog):
                 return w.hide()
-            w = w.parent()
+            w = w.parent() if callable(w.parent) else w.parent
 
 
 if HAVE_WEBENGINE: