Don't notify view of an installed game for extends scripts

lutris/gui/installgamedialog.py

@@ -445,6 +445,11 @@ class InstallerDialog(Gtk.Window):
             self.connect('focus-in-event', self.on_window_focus)
 
     def notify_install_success(self, game_id=None):
+
+        # Nothing to notify in case of extends scripts
+        if self.interpreter.extends:
+            return
+
         game_id = game_id or self.interpreter.game_id
         if self.parent:
             self.parent.view.emit('game-installed', game_id)